on iOS there often is a somewhat strange behavior.
You have an entry in a field without any html (You can check that before using the html view).
Then you edit something in that field in the editor (normal view). I haven’t found out yet, what it has to be. It doesn’t happen always, but more and more often.
Therby you get sometimes the following kind of pattern automatically, what of course is irritating, when your css wants something different in general.
This behavior seems to be relatively new. Maybe it came with some change in iOS?
Here a example, which pattern of html you get without wanting it:
<span style="color: var(--field-fg); font-family: -apple-system-body; background: var(--field-bg);">filth</span>