By default, the plugin caches all closed sprint reports because, in most cases, it is a permanent entity. You can disable the cache feature in the settings at any moment, but it may cause a load slowdown for sprint reports which contain a large number of tickets.
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When the cache is enabled and the JQL filter is filled, you should be careful because JQL can be temporal, with now() and sla (https://confluence.atlassian.com/servicemanagementserver/using-jql-queries-specific-to-slas-939926424.html) being good examples of these, often being compared to fields such as created.
Example:
if you cache on with JQL expression - "Time to resolution" < remaining ("2h"), the cached results can be expired immediately because remaining time is not a static value and changes in time.
More examples of "fast expired" JQL expressions
created <= -5dchanged <= -5d"Time to first response" < elapsed("10m")
For all the above cases, we recommend switching off the cache feature