To add to Aleks reply above, try checking your dataset permissions as well and make sure that they are set to ‘Anyone’ as some other users have had similar issues and the dataset being used was set as ‘Admin’ or Site Members’ etc.
https://support.wix.com/en/article/working-with-dataset-modes-and-collection-permissions
Once the dataset was changed to ‘Anyone’ the issue was gone, although yours might not be connected, it can just be a similar issue.
If this doesn’t solve the issue, then please carry on through Wix Support.