ok lol i can help you with this you are making the same mistake i did are you just taping G or are you holding it if you tap G you will drop the gernade at your feet if you hold G your charter will launch it

Hi,
while we are aware of some problems with this, it seems to me that the grenades can be thrown without a problem once the key is held, as the above comment suggests.
Please feel free to submit another ticket if you honestly believe this to be an issue.
Thanks,
Andy