We finally figured out what is causing it by comparing his wife's Find a Grave citation to his.
Kay is checking for 'family tree' and indicating that source may not be valid. Gordon's page was created by 'family tree maker', so his citation is getting a message.
His wife's page was created by 'genealogy friend', so it doesn't have any problem. Kay will have to fix BioCheck. but she is traveling for a few weeks. She will change the app and WBE, as soon as she is able to, but it could be a couple of weeks. Thanks for reporting it.