Display: File Explorer shows only two files

Whenever I have more than two Files on my USB Stick attached to the Snapmaker the File Explorer is only showing two files.
I seems that only the oldest Files are shown - even when I remove them the new ones are not shown … I have to remove all the Files and add the one / two that I need to make them visible.
I tried what happens if I click prev / next … but the List stays at the two Items.

I’m on the lastest Firmware 2.11

Anyone ever encountered that Problem?