Try these first
- Hard refresh — Ctrl+F5 on Windows, Cmd+Shift+R on Mac. This clears a stale cached stylesheet, which is the usual culprit.
- Private window — rules out extensions and cached sessions.
- Different browser — confirms whether the problem is local.
- Check your connection.
Reporting it
If it persists, raise a ticket and include your browser and version, the page you were on, and what you were doing. That detail is usually enough to reproduce and fix it quickly.