Don’t know if anyone else is having this issue, but I can’t search on the robloxdev.com website on mobile. Tapping the search button displays the search bar for a brief second, then it disappears again.
Video:
https://photos.app.goo.gl/14u3qfP8vkDgCTKk8
I’m using a Nokia 7 plus, running Android 8.1.0, on Chrome 68.0.3440.91.