I’m seeing the AMP banner appearing as expected on this website at the moment (https://droidbasement.com/db-blog/?amp), are you still experiencing any issues at the moment?
Validation warnings may appear when AMP detects “non-AMP supported” elements, but as these aren’t actually used in case of the AMP version of the site, this shouldn’t be a cause for concern.
The AMP integration should work fine, as also demonstrated on your site at the moment. This is a screenshot of the AMP banner on your site: