New compiler, new API version, something related HAD to go wrong, it seems.

Mappie 1.59 is truncating map details (Fractional points) and as such, maps can be considered to be corrupt (or at least, losing detail) on save.

Mappie 1.59.1 release corrects this issue, and is recommended if you downloaded 1.59 to upgrade immediately. The same down loader will automatically use 1.59.1.