Rebuild your form one step at a time. Note when the checkboxes stop working. That identifies where the problem is. Once you know that there may or may not be a way to resolve the problem.
A checked check box has a check-mark inside. If those are supposed to be bound, they look like they might contain nulls, i.e. improperly bound and with warnings disabled. At least, that is how I would interpret the image you showed us.