I've the same problem.
I always use drafts to log. while with version 4 the numbers of find was correct in the drafts (geocaching finds + 1) with version 5.x it's not.
In cachly/profil the #funde is equal to the one in geocaching.com, so when creating a draft it should increase the number by one.
I close (but not logout) & kill cachly after a trip and reopen it for a new day, so it should be actual because I'm also working with "live".
using version 5.0.4(1) on iOS12.1.4
hope that helps to solve the ugly error