Firewall filters are all blank

All my firewall filter conditions have been set to blank(leaving my server at risk) and when i try to disable them i get this error message:
filter not found (Code: 10203)
what could of caused my filters to clear out( this wasnt done by me ) ??

Are you on the overview page? Because filters help you drill down into firewall events… actual rules are configured on the other tabs.

Yes owner of the page. The firewall rules were there populated with their conditions working well for over a week then I noticed ddos traffic that I filtered was hitting my server. Checked the rules all conditions had disappeared but the rule names were still there. Only option was to recreate and now working fine again. I left one rule so I could get support to take a look as to what happened