Pre-report note: this is encountered by a friend of mine, not me, I cannot currently verify his claims, yet I will post this bug on his behalf
Report: when selecting any chaff values, while in a test drive it shows both properly, in a match it shows only flares (ex: 128 flares and 0 chaff instead of 64 flares and 64 chaff), while he can use both separately, even though it shows 128 flares no matter how much chaff or flares he spends