Hello. Your highlighter is ASP or HTML multihighlighter? If you want to use definition from ASP, you need to switch highlighter to ASP or remove ASP from HTML multihighlighter.
Where is defined your comment? In the DEF file with shortcut? In this case you need to remove standard shortcut for Comment/uncomment (menu Format) -- <https://forum.pspad.com/read.php?2,71349,71351> PSPad freeware editor https://www.pspad.com
