- Plesk Obsidian for Linux
The symbols "xdcbxbxcvb" appeared in the mobile version of Plesk interface, e.g. on Plesk login page with Google Authenticator:
The same issue may appear on the main page under the menu elements.
This is Plesk bug with ID EXTCATALOG-320 which will be fixed in future updated.
Until the bug is fixed, safely ignore these symbols.