One of the deleted topics was irrelevant. The videos showed checklist.miracheck.com, which does not appear to be a Discourse forum. The other, as seanblue suggests, is the same issue, trying to use Desktop Mode on a mobile device.
First step is confirming if this is a persistent issue in the site, across all users. Have multiple other iOS users reported the same issue? If not, we have to assume it is device specific (your phone).