What kernel release / patch level is the system on and what is the basis support package level?
This issue is probably related to ITS or Webgui rather than Personas itself.
You could try the following:
Apply note 1972793, it will probably pull in additional notes, among them 1917981. Should that note not be loaded automatically, apply it manually.
Then go to transaction SITSPMON, go to tab "Template & Mime Cache" and click on button "System-wide" in both of the boxes (Invalidate Template / MIME Cache). Then clear the browser cache and check if this fixes the issue.