From your screenshot, I assume that could be the reason why your A mail record switched back to the .
There were topics lately as similar as yours like “record deleted” or “record switched to old value” for the customers having some errors or issues with eZoic.
One recent here:
Kindly, please log into the eZoic interface with your eZoic account and then find the DNS management tab and make the change you need to for your A mail record from there.
This also applies for any further changes you need to make.
Otherwise, if you change something at Cloudflare dashboard, but not through the eZoic interface, it will be reverted back to originals (there were few topics about where people have had changed or added a new or existing DNS record and it was removed somehow without a notice ) - which seems to be your case too.
Some other topics about eZoic questions/issues could be found here at Cloudflare Community by using :