I will upload the screenshot soon, whenever this pops up.
This is a bug that existed from long time ago, but I will report this now because I think this is necessary nowadays.
So skills like you pull out something to throw(Molotov, Frag’s nade), or even PDA that objective specialists, sometimes it shows up, even the skill is already used, or C4 was already planted so pulling out your PDA is useless action.
For instance, Fragger handling his pineapple after he already threw it, same as Stoker’s molotov, and Fletcher’s Sticky bomb(Of course can’t use the skill twice.) you are objective specialist, there is ‘Plant C4’ sentence at the screen, but you fail to plant C4(Everytime you press F, you fail. Only Planting motion comes out.) because C4 is already planted. This C4 thing also applies to non-specialists I guess, but it is so rare trying to do objectives with other merc class.
Anyway, I have no exact ideas why this happens, but may be I pressed 4 or Q accidentally, after using the skill. After throwing molotov, holds another molotov but can’t use it. Makes people quite confused.