Why do I get less RP for some kills than others?

I had a very good match where I got 6 kills. I got 4 in the next one but noticed I got more RP for the 4 than for the 6 so I looked at the RP per kill and saw the message “Own target (the rest of the reward)” behind 5 of my 6 kills with much lower RP rewarded for them. What is that? I shot and killed all 6, no assists. I don’t understand how only 1 of the 6 got “Full reward”, giving me 5 times more RP, than the other 5. Can anyone please explain?

Battle results posted below.

Victory in the [Operation] Moscow mission!

Destruction of aircraft 6 13399 SL 1078 RP
2:37 Su-33 R-27ER F-14A Early 89 mission points Own target (the rest of the reward) 893 + ¶447 = 1340 SL 56 + ¶56 = 112 RP
3:04 Su-33 R-27ER F-20A 425 mission points — (full reward) 4466 + ¶2233 = 6699 SL 263 + ¶263 = 526 RP
3:34 Su-33 R-27ET F-4S Phantom II 79 mission points Own target (the rest of the reward) 893 + ¶447 = 1340 SL 50 + ¶50 = 100 RP
3:38 Su-33 R-27ET Yak-141 89 mission points Own target (the rest of the reward) 893 + ¶447 = 1340 SL 56 + ¶56 = 112 RP
4:01 Su-33 R-27ER Su-33 90 mission points Own target (the rest of the reward) 893 + ¶447 = 1340 SL 58 + ¶58 = 116 RP
4:13 Su-33 R-27ER ◌F/A-18C 89 mission points Own target (the rest of the reward) 893 + ¶447 = 1340 SL 56 + ¶56 = 112 RP

Severe damage to the enemy 5 26800 SL 2198 RP
2:37 Su-33 R-27ER F-14A Early 355 mission points 3573 + ¶1787 = 5360 SL 222 + ¶222 = 444 RP
3:34 Su-33 R-27ET F-4S Phantom II 315 mission points 3573 + ¶1787 = 5360 SL 199 + ¶199 = 398 RP
3:38 Su-33 R-27ET Yak-141 355 mission points 3573 + ¶1787 = 5360 SL 222 + ¶222 = 444 RP
3:55 Su-33 R-27ER Su-33 360 mission points 3573 + ¶1787 = 5360 SL 234 + ¶234 = 468 RP
4:13 Su-33 R-27ER ◌F/A-18C 355 mission points 3573 + ¶1787 = 5360 SL 222 + ¶222 = 444 RP

Critical damage to the enemy 4 2684 SL 226 RP
2:37 Su-33 R-27ER F-14A Early 148 mission points 447 + ¶224 = 671 SL 28 + ¶28 = 56 RP
3:38 Su-33 R-27ET Yak-141 148 mission points 447 + ¶224 = 671 SL 28 + ¶28 = 56 RP
3:55 Su-33 R-27ER Su-33 150 mission points 447 + ¶224 = 671 SL 29 + ¶29 = 58 RP
4:13 Su-33 R-27ER ◌F/A-18C 148 mission points 447 + ¶224 = 671 SL 28 + ¶28 = 56 RP

Damage to the enemy 11 3685 SL 298 RP
2:37 Su-33 R-27ER F-14A Early 25 mission points 223 + ¶112 = 335 SL 14 + ¶14 = 28 RP
2:37 Su-33 R-27ER F-14A Early 25 mission points 223 + ¶112 = 335 SL 14 + ¶14 = 28 RP
3:04 Su-33 R-27ER F-20A 25 mission points 223 + ¶112 = 335 SL 13 + ¶13 = 26 RP
3:04 Su-33 R-27ER F-20A 25 mission points 223 + ¶112 = 335 SL 13 + ¶13 = 26 RP
3:34 Su-33 R-27ET F-4S Phantom II 25 mission points 223 + ¶112 = 335 SL 12 + ¶12 = 24 RP
3:34 Su-33 R-27ET F-4S Phantom II 25 mission points 223 + ¶112 = 335 SL 12 + ¶12 = 24 RP
3:38 Su-33 R-27ET Yak-141 25 mission points 223 + ¶112 = 335 SL 14 + ¶14 = 28 RP
3:38 Su-33 R-27ET Yak-141 25 mission points 223 + ¶112 = 335 SL 14 + ¶14 = 28 RP
3:55 Su-33 R-27ER Su-33 25 mission points 223 + ¶112 = 335 SL 15 + ¶15 = 30 RP
4:13 Su-33 R-27ER ◌F/A-18C 25 mission points 223 + ¶112 = 335 SL 14 + ¶14 = 28 RP
4:13 Su-33 R-27ER ◌F/A-18C 25 mission points 223 + ¶112 = 335 SL 14 + ¶14 = 28 RP

Awards 14 19125 SL
3:04 Multi strike! 100 + ¶50 = 150 SL
3:35 Shadow strike streak! 100 + ¶50 = 150 SL
3:35 Multi strike! 500 + ¶250 = 750 SL
3:39 Fighter Rescuer 50 + ¶25 = 75 SL
3:39 Shadow strike streak! 100 + ¶50 = 150 SL
3:39 Multi strike! 500 + ¶250 = 750 SL
4:01 Professional 150 + ¶75 = 225 SL
4:01 Shadow strike streak! 100 + ¶50 = 150 SL
4:01 Multi strike! 500 + ¶250 = 750 SL
4:13 Professional 50 + ¶25 = 75 SL
4:13 Shadow strike streak! 100 + ¶50 = 150 SL
4:13 Multi strike! 500 + ¶250 = 750 SL
4:55 Hero of the Sky 5000 + ¶2500 = 7500 SL
4:55 Survivor 5000 + ¶2500 = 7500 SL

Activity Time 2800 SL 40 RP
Su-33 1400 + ¶1400 = 2800 SL 20 + ¶20 = 40 RP

Time Played 4:27 2854 RP
Su-33 85% 4:27 1427 + ¶1427 = 2854 RP

Reward for winning 23055 SL

Skill Bonus 3347 RP
Su-33 III 3347 RP

Vehicle research bonus 3347 RP
Su-33 3347 RP Su-17M2 VII 3347×100%=3347 RP

Earned: 91548 SL, 10041 CRP
Activity: 85%
Automatic repair of all vehicles free.

Researched unit:
Su-17M2: 12049 RP

Session: 5ce2c00003ea907
Total: 91548 SL, 10041 CRP, 12049 RP

Edit: Typos

It’s to do with the severe damage mechanic.

Of all your kills, only the F-20A at 3:04 was an outright kill without you having inflicted severe damage beforehand. For the other targets, if you add the RP you gained for causing severe damage to the RP gained for killing them, you arrive at a similar total.

Severe damage counts for like ~80% of the kill rewards so you need to include that to the destroyed vehicles when you’re counting the rewards. It can also differ from vehicle to vehicle and if there is a BR difference between you and the destroyed target matters as well.

I understand thank you