World Partition: Level way too big after upgrading to 5.1

Hey there, I’ve created a 4x4 km map in 5.0.3 and I’ve been trying to open it on 5.1. After opening the project in 5.1, the map size in world partition editor is showing as 32.77x32.77x32.77 km. If I unload all partitions and load my original map sized 4x4 km everything is working without a problem. Is there a way to make the map smaller as the original size ? (4x4) Does it working as intended ?