The NPC is Dandera Selaro just outside Skar, it seems her inventory differs depending on what direction I approach her from. If I initiate dialogue from her right side, she'll have about 3x as many items to trade than if I approach from her left. I've no idea what is causing this, anyone come across anything similiar?

have you any MWSE or other mods installed .?

don't know if vanilla has direction detection other than getdistance function

if not those then only something with leveled lists comes in mind in game mechanics... mods add them whole list at a time becos of esp and esm

Its becuse she is right smack on cell border. You get the items which are present in the same cell as you.

So this is a vanilla issue? Do any other traders suffer from this?

Its a vanilla issue. I don't think it affects many others as there aren't many traders outside in cities. May be Sadrith Mora, I don't know.

usually workarounds are made and tutorials mention those.

sometimes the merchant chest get duplicated from outside of the cell what have heard. which way is nearer the chest on the table ?

selaro hasn't got anything but basics in his invertory in CS

how you can see cell borders actually ? he's half a meter if that's from the border looking from pathgrids

MCP or some other may have fix. wouldn't say it's a looted problem althought there may be a mod to adjust positions

Strange that this has not been fixed in any of the unofficial patches. But interesting nonetheless.