I have a Multi-Select Choice Component in a Form which does not allow selecting in some browsers on some PCs, but otherwise works OK:
Quinta do Lago Country Club (qdlcc.com)
Any help would be highly appreciated.
If anyone is to try to help troubleshoot the issue or potentially fix a bug, then they’ll need to know a little bit more about the issue: what browsers, maybe screenshots or a video showing the issue.
Is the below what you are referring to? 
If yes, then my guess would be that the localisation settings of some browsers interpret the periods as commas, which breaks the multi-select.
What you should do to fix that is separate what is displayed from what is written. That is, instead of writing those display values to the target column, write the RowID instead.
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