Cross-writing files?

Question

Hard disks

I can't find a term to describe the effect, but the computer seems to have a life of its own.
File J:\VM\MailInABox\MailInABox.vmdk got the following content . This text should be in J:\Projects\GlebFixed\GlebFixed\app.xaml, but not in MailInABox.vmdk. The labImportApp.csproj file put together a mess from a bunch of other files. And there are many such examples.
The option of human modification of files disappears, access to the PC is controlled. The virus doesn't matter either.
A similar effect is manifested only on this PC, I have not seen it on other similar ones.
What is happening and why are the files written inconsistently?