Thanks!
I’m not a multisite. I created style.php and single.php files in my child theme to make changes to the plugin using the functions.php. Is this not allowed? Otherwise in every plugin update everything will get overriden.
The cache topic is related to the WP Fastest Cache. I will temporarily deactivate it for the moment until I find a better solution for the desktop version.
For the AMP boilerplate CSS I did a test changing back to plugin default and I see the same code in the source. Where could I change this? Now not sure if I changed these somewhere but doesn’t ring a bell…
<style amp-boilerplate>body{-webkit-animation:-amp-start 8s steps(1,end) 0s 1 normal both;-moz-animation:-amp-start 8s steps(1,end) 0s 1 normal both;-ms-animation:-amp-start 8s steps(1,end) 0s 1 normal both;animation:-amp-start 8s steps(1,end) 0s 1 normal both}@-webkit-keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}@-moz-keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}@-ms-keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}@-o-keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}@keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}</style><noscript><style amp-boilerplate>body{-webkit-animation:none;-moz-animation:none;-ms-animation:none;animation:none}</style>