Seeing the same thing in shop for 2 hours

Pretty much as the tittle says, seeing the same gun and weapon for 2 hours is not okay imo.

I am waiting to buy a better eviscerator or thunder hammer but I always get the same axe and autogun

no chainaxe, chainsword or anything that remotely interesting just same axe axe and axe

is this a bug or i am just having a shitty luck with the shop ?