From what I can tell from the documentation on this mod, the "compass_personal" is supposed to point to the player's latest spawn point, but it actually never moves for any reason. It's like the needle is just painted onto the face of the device. One can turn around in circles and walk all over the place, and the compass doesn't budge.

I tested this in two worlds in survival before creating a fresh install of 1.12.2 with no other mods but Iberia, and the behavior persists. The Iberia version is 2.0-25.

Here is a log generated during my testing:
https://pastebin.com/r1NCGUzm

Note that there is also a parsing error during the loading of advancements related to the compass. I assume this is due to the fact that the vanilla compass recipe has been suppressed.