Files don't save to desktop
Just yesterday, I began having problems saving to the desktop. I'm using Mojave 10.14.6. When saving a file to the desktop, do not get any error message but it does not appear on the desktop. When I try to save it again to the desktop, I receive a notice that it already exists on the desktop and do I want to replace (but I don't see the file on the desktop). If I restart the computer, I am able to save a file to the desktop (and see it) but I don't know how long this will last until the issue starts happening again. Files save properly everywhere else (in Documents, Downloads, specific folders, etc.). Any input? Thank you.
iMac 21.5", macOS 10.14