Understanding Hold Time Violaitons

I inherited a quartus design for the first time and am trying to resolve a number of timing violations.

The timing report is flagging a hold time violations in red but I'm not comprehending what exactly its telling me. Specifically the "Hold Summary" report under "Timing Analyzer".

I expect timing violations to have source clock/signal and destination clock/signal but this report only has a single column for "clock".

So what am I looking at and what am I missing?