Giving trust from seller's side is not possible

Device: PC
Browser: Chrome (96.0.4664.45 (Official Build) (64-Bit))
OS: Windows 10 Home (Version 21H1)

Steps to reproduce:
After the buyer left a comment on my trade listing and I sold it to him only he was able to give me trust after marking the trade as sold, despite him having left a comment on the thread.
Trade Link: trade/guillaume-s-face-t468665.html

Anything else to add: I got a feeling that it is probably an issue with the apostrophe in his user name.

Hey Silec, yes that apostrophe could be troublesome for a query somewhere. Will look into it.

Hello guys,

I've just checked and there are no problems if I'm a seller.

Best regards,
J.

EDIT: is this possible, that it also affect the preview window? In trades I'm shown with positive Trust, but when I hover over my nickname, it shows 0.