There is a bug in the activity pzFetchCaseStatusUpdate in the ruleset Pega-EndUserUI. The bug was introduced in ruleset version 07-10-15 and persists in 07-10-17. In step 8 of the activity, the property pyCollatedAudit.pxResults(param.currentSize).pxCreateDateTime is being set using bad logic. If the case in question has more than one key, the parsing does not grab the date correctly. The parsing is looking at the FIRST index of an exclamation point when it should be looking for the LAST.
This activity is called from the section pyCaseNarrativeWrapper. Our resolution to the problem was to remove the Case Narrative from our screen as it did not provide that much value anyway.