Actually, there is this known bug for this issue :
https://ecosystem.atlassian.net/browse/STRM-1446

However would be helpful to repair the warning from the log as we can see here:

WARN [StreamsCompletionService::thread-260] [atlassian.streams.internal.AppLinksActivityProvider] handle Unable to retrieve filter options from /rest/activity-stream/1.0/config?local=true

Let us know if is possible to remove this warning without jira/Confluence upgrade.

Also, related with this KB: Activity Stream - Unable to retrieve Filter Options