XnView Software

It seems to have sorted itself out. I wish I could be more helpful with how I got it working, OP's method didn't work and I've deleted the sort file and let it regenerate but that did nothing. I believe setting it to custom, closing the program, and then adding more images to the folder did it?

I do. I tried deleting it to reset it but I'm still getting the same issue.

I'm having this same issue. I try to sort by date and drag an drop a thumbnail to sort it differently, but it resets everything to be sorted by name. If I sort by date but then choose custom sort it still resets everything. I'm running XnView MP 0.92 x64 on Linux

Screen recording:
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