Board Thread:News and Announcements/@comment-5588749-20160910172716/@comment-26178810-20160915092240

Yeah, its getting confusing for the upgrades. It not just affects the Dead Star alone but the other weapons with upgrades are also affected by this glitch/bug (or it really changed in the course of the update?). Such as the Icicle Minigun's and Frank Sheepone's upgrades (and numerous others) are affected by this confusing change/bug/glitch.

If this is a change, possibly Rilisoft just 'removed' those upgrades for the new weapons to fit into the game.