Why did the obsdian files rename themselves?

I have a problem suddenly a lot of files in Obsidian disappeared, I started to look in folders there they were with changed names at the end to the name added ~20231119-105317
So the file was for example IMG_8417.jpg and became IMG_8417~20231119-105317.jpg.
What could be the problem and how to fix it ?
I guess it has something to do with synchronization, I use Syncthing for windows AND icloud for macbook and iphone.
Maybe I need to synchronize only in one Syncthing ?

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