"files are same" error on cifs share

[krita]

Hi,
I have an issue never experienced before. I have two PCs; PytteDatan (Debian Stretch, I think) and Lilldatan (Debian Buster). On Lilldatan I have mounted a drive like this in /etc/fstab;

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//PytteDatan.local/markus    /mnt/markus   cifs   credentials=/home/markus/.smbcredentials,iocharset=utf8,uid=1000    0    0

Accessing the mount folder /mnt/markus/Dokument/octave/pg_winch2 there is a file named "PITWVK~3.M". Issue is that on the remote PC PytteDatan the file is actually/correctly named "prn.m" not "PITWVK~3.M" .
If I do

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markus@Lilldatan:/mnt/markus/Dokument/octave/pg_winch2$ ls -li
totalt 2048
8390077 -rwxr-xr-x 1 markus root 808 dec 28 11:43 drum.m
8390242 -rwxr-xr-x 1 markus root 180 dec 28 11:49 PITWVK~3.M
markus@Lilldatan:/mnt/markus/Dokument/octave/pg_winch2$ mv PITWVK~3.M prn.m
mv: 'PITWVK~3.M' och 'prn.m' är samma fil

...I get (freely translated) "mv: 'PITWVK~3.M' and 'prn.m' are same file".

I can rename the file to something else, like prn2.m, but the name prn.m just won't work.

The closes match to a similar issue was found below, but does not solve my problem.
https://askubuntu.com/questions/835356/ ... -same-file

I have absolutely no clue about what is going on here... Your ideas would be very appreciated! Anyone?

Thanks
Markus