After the leviathans update all air to air or ground to air IR missiles stopped working correctly. (r73, IRIS-T, magic 2, 9M and more)
And keep going for bombs or anything that is not a plane or heli. even when they are right behind them!
making it almost impossible to hit anything if they drop any form of munition.
so if a plane drops a single dumb bomb 2 sec before your IRIS-T hits they will go for the bomb instead of the glowing hot engine of the plane or heli that dropped them! :)
This is why your IR missiles keep missing on people that fire of cas munitions or bomb bases!
here is the bug report:
https://community.gaijin.net/issues/p/warthunder/i/w6NdmslnQ5bV
I hope many more people will vote so that gajijn will see this and act!!
PS: if you have a clip of it happening to you please post it so we can expand the bug report with more clips!
example: