Creation of these files is expected behavior, however they should be clearing automatically. They are usually not cleaned up mainly due to two reasons - AV and/or lack of permissions.
Pls ensure if running any AV, it is set to exclude from scanning the BE processes and directories. The BE service account should have explicit full access to the C:\ drive.
Lastly, stop all BE services and delete the temporary files (these are actually leftover mount points). Check if the issue reoccurs or not.
