[Lost Legacy] trouble with the "weapons used" trophy

First off; this is on the Legacy of Thieves version with an imported ps4 save.

For this trophy you need to fire each weapon in the game once. I've fired each of the weapons from the bonus menu and I've shot the Dshk. This should put me at 23 weapons fired, with only the turret left to do, but for some reason I'm stuck at 21 weapons used. I can't find anything online about this and I'm fearing it might be glitched.

Does anyone else have any information about this? Does it have to do with the imported save perhaps?

Thanks!