So, when I throw a grenade with G, I can quickly press "F" and the grenade will blow up in my face. Took me a long while to learn why I was getting blown up for no apparent reason, but that's why. Is this a bug or a feature?

So THAT is why it was happening??? OMG!!! I was always thinking that it is because enemy managed to hit my grenade in air when I just managed to throw it!!! Thank You The Soldier for finding out why is it happening! Now at least I will know what I should do not during combat, when throwing grenades.

That surely is an odd one, certainly not intended to be like that. Maybe the soldier tries to pick up the grenade? Then it gets removed from world and removal event makes the activated grenade turn into explosion, yeah, something like that.

EDIT: ok got it fixed, nice find!

Thank god. Much appreciated, pasik!