I've been having an issue where cave maps will sometimes be somewhat inaccurate, with the marked area on the map not really lining up with the cave biome itself but bringing me close enough to find it anyway, or will sometimes lead to literally nothing with no cave biome in the area at all. The surrounding biomes on the map are still accurate.
The only installed mods that affect overworld biome generation are Alex's Caves itself and Ars Nouveau.
This issue is happening on mod version 1.1.4

I also just got a map that led to a cave biome, just the wrong one. Those are probably linked.

Known issue