I recently recreated a lost WordPress web site. I uploaded a standard theme and I have since been modifying the style.css file to get the appearance back to how it was.
Android/Opera only shows the webpage with the standard theme (with, for example, some blue text). Refreshing it does not show the modifications (with, for example, some red text).
The changes show correctly after refresh on
and various browsers on Linux (but not Vivaldi! That's another story. It still shows the website as it was before it got destroyed!)
My Android version is 6.0 on an Alldocube iPlay 8 tablet. I'm not sure what version of Opera I'm using, but presumably the latest.
I'm not sure if data savings is enabled.
If I press on a link and hold it so that a menu appears and I choose "Open in private tab", the correct style is shown.
Please let me know if you need more information.