I just started a new character and found my first shop on floor 1. In this shop i saw a time lord scarf among the other low lvl items. is it normal for such a high lvl item to appear here or does this happen on every floor?
Items from lower levels of the dungeon can show up on floor 1. For that matter, floor 1 items can show up on floor 15. It's just generally very uncommon. Given enough time, you'll invariably run into scenarios where Maslech, the Eater of Beatings is available from a mini-Brax shop right next to a staircase to the next floor.
I think the first floor gets more high level items in its shops than any other floor (and that definitely has nothing to do with how I have been to the 1st about 100+ more times than any other floor). And they are also the thing that has killed a promising build more than anything else.