Hi Sarah
Have you read this article:
It shows you how to wire up a dataset, mapped to your data collection, to your check boxes so that when a check box is clicked the dataset is updated.
If you use this you can automatically set the values from the dataset when the [age loads as well as set values.
I had a brief look at your site but do not have access to your Editor so don’t know what your hook code looks like. Not being a Wix employee I can’t see what you have done. Feel free to post the code you have written for further advice.
Steve