Welcome to Geocaching and Cachly.
The 3 cache limit is not Cachly but Groundspeak/Geocaching.com . The last I recall, there official app didn't have a 3 cache limit butt restricted the caches to only those with a 1.5 or less difficulty abed terrain rating. Groundspeak imposes the 3 cache limit on partner apps like Cachly but there is no difficulty/terrain limit.
Does it make sense- maybe to Groundspeak. Nothing that Cachly can do though as it's a requirement that Groundspeak requires Cachly and other apps to follow.