This mod seems to be summoning nuclear bombs from thin air in all spidertrons tested (possibly from another inventory? my player and other spidertrons have some) when remotely driving. Not entirely sure of the cause beyond just cycling weapon types when only normal/explosive rockets available.

It fetches ammo from a bunch of places including the player's inventory, so if there's any to be found there it will grab them. You can choose which inventories to turn off in the settings, see if it fixes it!