infinite loading hideouts (Trading)

I'm trying to purchase inscribed ultimatums and I've attempted 5 different sellers and it seems they're abusing MTX's or something because for all 5 it's taking an infinite time to load, I would just alt f4 then go to the next but it kept happening so I'm unable to buy them without having to alt f4 my game, I tried doing one other trade not related to inscribed ultimatums and it worked, very frustrating