Merchant 42750 gold bug in Skyrim

Questions: Does this apply to all merchants?

Do the merchants break above 30k gold, or above 42750 gold?

Why does this occur?

Can this be fixed?

Are there anything else I should be careful about when dealing with merchants?

Answers: Possibly. I haven't had the time to go around to every merchant and add 30K gold to their salary ha-ha. All I know is that it effects most merchants that you can either train with them, or they sell expensive items.

It usually breaks around 30K gold - 40K gold. It's due to the fact that NPCs don't hold much data. It's pretty hard to explain, but I don't think Bethesda programmed the merchants to hold more than 40K gold.

It probably can't be easily fixed. From user mojodajojo on nexusmods:

However, you can script a merchant's chest to remove excess gold when it gets over a certain amount.

Probably not to train too much. You can easily level up by just using your weapon, or lock picking. Hope this helped!