dragon3025
Terrarian
This is normal. When an item is added to the Traveling Merchant because of a success in my mod's chances for it, it'll add the item to what he's already selling. In this case, he's selling the Gatligator for a success in both the vanilla and the modded chances, so it's one for vanilla and another one for Reduced Grinding.
For some reason he decided to sell the Gatligator twice at the same time lol.
This happened after defeating copious amounts of slimes to restock his items a bunch of times.