Alright so, since yesterday, Ive encountered this problem where I have been researching the panther, and the japanese F104, Ive had pretty good matches to add enough rp to completetely research those vehicles however, even after winning, the rp just wont add and its still stuck with the same rp as it was before starting the match, here is an attachment as proof.
Because the RP you mean goes to the helicopter, you need to remove the tick in the bottom right.
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In the lower right corner of your tec tree, left to the “auto select” thingy, you have a box ticked that makes all your tank RP go into heli research.