Yes, the maximum is per dependent and you should be able to get the full $1,500 unless there is another limiting factor. If your Wisconsin income tax is reduced to zero, then the credit could be limited.
Since this does not appear to be the case, then the next thing to confirm are whether the account beneficiaries were identified separately or to delete Wisconsin completely and re-run the state. Be sure you are using a Windows PC in Chrome, not a Chromebook or iPad.
@rgkleist
