Thanks a ton for your super fast and friendly reply! Alas, no change.
I did some work on this site on a Serverpress- DesktopServer and migrated to the live server. Since then I noticed all my changes I made on ECST Plugin have vanished. De-and reactivating ECST, EC and even the majority of my plugins and of course saving changes in ECST and purging caches didn’t do the trick.
Thanks for the effort anyway!