Weird bug when saving Indesign file

[Najade24]

Everytime I save an Indesign file on my apple laptop a second copy of the file will appear but then in a photoshop format. I cant open the file since its not functional for photoshop and when I delete it the file just pops back into my folders.

I only get this bug when saving stuff from Indesign, none of the other adobe programs do this.

Does anybody have an idea why this happens and how I can prefent it from happening again?

[Derek Cross]

Which version of InDesign and OS?

Have you tried resetting InDesign back to the factory defaults?

[Najade24]

Indesign version 18.3 and Mac version 11.0.1 but this bug has been here for a while. 

Havent tried resetting yet.

[BobLevine]

Turn on file extensions for all file types. It sounds like you're seeing a lock file which is perfectly normal.

[Najade24]

Where can I turn this on?