From looking at the screen,
@FAR2019, did your error occur after filtering for steel offers, then attempting to switch back to the main trader?
@helya - another thing I forgot to note in my post and I noticed also in
@FAR2019's screen: you can see that it says "1/1" for the number of pages in the trader, but you can also see that the green arrows are available to be clicked, as they would be with multiple pages of trades.
I checked ElvenStats to verify the avatars for the users in FAR2019's screen because I don't have an account in Khelonaar. Neither show as having the avatar screened.
DewBee -
https://www.elvenstats.com/player/us4/1658651
Crimson -
https://www.elvenstats.com/player/us4/849820717
The screen in
your post shows you filtered for T1/T2/T3 goods.
@Myne's screen, like FAR2019's, shows filtering for a specific item offered. The text says steel, the item chosen is different in both cases. The one thing all four of our screens have in common is that we attempted to filter for something when the bug showed.