Not sure if it’s because the trading post was upgraded a few game years ago (not while any traders were there) or whether it’s just Bedlar, but the transfer gold from storage to trading post seems to go wonky when he’s there.
It’s adding the gold in storage (2,906) to the amount that’s in the trading post (56) to get 2,962 and says it’s all in the trading post - which it isn’t. I can still use the slider to transfer gold from storage to trading post, but it’s weird that this only happens with him and no other traders.
Edit: Okay, even more weird. Exited the trading post to save the game in case you needed it and then went back into trading post and it’s corrected itself.