Data field can be clicked but mention source field can not.
We have checked a few times and eveything seems to work fine. please see this demo page where you can check if it works correctly or not. https://bubble.is/page?type=page&name=rte&id=zeroqode-demo-06&tab=tabs-1
if it doesn’t work as on the demo page i’d suggest uninstalling and reinstalling the plugin (nothing should break when you do this), also you could try moving the element on the page 1 px right and then left to reinitiate it. If none of this helps I guess you’d need to file a bug report with Bubble https://bubble.is/bug_report