I don’t know if this makes a difference, but this is specifically on Minecraft 1.16.5. Essentially, even when I had the correct mods in the mods folder and they were even still working great in-game, it didn’t appear on the Mods list in the curseforge application. About four of the nine or so mods actually displayed in the mods list, two of which were fabric api and fabric jumploader, the other two were hwyla and simple backpacks. These were all fabric mods, some of them just weren’t displaying even though they worked perfectly fine. These included the Better End and Better Nether mods, Xero’s minimap and Xero’s world map, oh the biomes you’ll go, and roughly enough items.