Obviously, you are supposed to be able to print to them, since they are how a local printer can be accessed from a remote session. Example: You log into Right Networks, but the Excel spreadsheet you create there is something you want to send to a local printer.

I wonder if you don't have a server where you are allowed multiple concurrent sessions? You might want to read some explanations on the web, such as:

https://infusionsoftware.zendesk.com/hc/en-us/articles/360001188616-Redirected-Printer-Explanation

https://community.spiceworks.com/topic/426372-redirected-printers

https://blog.powerbiz.net.au/fixes/how-to-turn-off-printer-redirection-for-remote-desktop-sessions-o...

And this is the setting I recommend:

https://infusionsoftware.zendesk.com/hc/en-us/articles/115008121968-Windows-10-Default-Printer-Issue...