Then it seems like this is a browser-specific issue. You can report it since iOS Safari is supposedly a supported browser. However, since that is the only browser with this issue, I doubt it will get fixed anytime soon.
Sorry, I was a bit confused because the scrollbar didn't show up on Desktop Firefox either when I checked the page earlier and I thought it was supposed to be like that (with that CSS styling). However, the table was scrollable now when I checked again, in both Desktop Firefox and iOS Safari. Maybe it was just a temporary issue?