Minecraft – this strange mouse cursor showing in minecraft fullscreen, and how to get rid of it

The XBox uses a FAT32 format system, whereas most PCs use NTFS. The two versions are way off in terms of update progress. Also, PC saves use a different storage system than XBox, having converted to Anvil storage quite a while ago.

you most likely cannot see players on the map because you aren't using a locator map. By default when you create a map it will no longer show your location or player locations. If you combine the map with a compass in the crafting table it will become a locator map and give these player locations.