I created a simple survey (US States visited) in Connect (3.23.48). Everything displays/works fine in the Survey123 Field App.
When viewing the survey in the browser, when a state gets selected the checkbox disappears
If I try clicking it again, the screen shows up as:
Also, the submit button is not showing but is there if you mouseover at the bottom. I've tested on both Chrome and Edge with same results.
Ended up just recreating the survey using web designer, still don't know why the translation of the html/code from Survey123 connect to web got broken.