Counts changed to 0 for old posts and stay at 0 when sharing

Hi immizen,
in your article https://omicshelpdesk.com/what-s-up-microbes/ Facebook had not yet scanned the page (sometimes happens).
You can use the Facebook Debugger https://developers.facebook.com/tools/debug/ to make scan or re-scan a page for Facebook.
Now I made a new scan for your page and now Facebook shows 1 share.

Best Regards,
CrestaProject

Interesting. Thank you!
The 10 shares I had on a different article are back: https://omicshelpdesk.com/from-genotype-to-phenotype-things-you-can-do-with-your-23andme-raw-snp-data/ are back.

So, is it normal to lose the counts and do I have to re-scan my blog page for Facebook periodically? Why does it “lose” counts?

Not only the shares, the Facebook Debugger also serves to obtain information of the page when it has to be shared (title, text, image, and other information).
But I do not know why this happens, usually it happens to newly published articles…

Best,
CrestaProject