I have cured a cartographer zombie villager to get a lot of empty maps for me for a cheap price. Problem is, after some trades, the villager locked the trade, just like it always do and I waited till he went to his work bench so the trade would unlock and I traded until it locked again. But once it locked his trade 2 times, after he unlocked the second time, the price raised above 1, which was the price I was trading at. I have tried trading more times to see if he would discount again his price, but he did the opposite and increased again. The price is now bigger than the base price, even though I never hit or killed any villagers nearby.

I have looked up everything on the Minecraft Fandom Wiki, but it doesn't mention anything about increasing price after trading too much.

Steps to Reproduce:
1. Cure a villager.
2. Trade with him until he locks and unlocks 2 or 3 times the trade.