I was downloading mesh packs to add to my map.
I downloaded WulftheWolf's woodland mesh pack and moved the .object to the object folder. When I went back onto my map, the default grass that FeralHeart already gives you was replaced with the mesh pack's Grassss. While beautiful grass, it looks terrible where it is. The default was the desired grass. On top of that. I cannot find the FeralHeart default grass on the map maker.
To clarify, I had already planted the grass, and it was changed by itself to the new grass.