Unpickable items, vendors not talking

[Octopuss]

Have you ever run into items you can move around but not pick up? I noticed it a few times. For example, in a shot in Falkreath there were 3 arrows on a table, I stole 2, but the third could only be moved around, but there was no way to take it. Really weird.

Or the Riverwood trader, once I entered the shop and he just wouldn't interact (he did in the previous game with same mods and stuff). I'd click on him and nothing happenned. Reloading, reentering the shop didn't help. And now I found out two vendors in Falkreath do not open any dialogue menu, they just say something when I click on them. Really weird stuff...