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I tested your form (NICE CLIENT APPLICATION) and I was able to replicate the issue. However after cloning your and did a test on my cloned version of the form it functioned just fine. Could you try cloning your form to see if this will resolve the issue.
These guides will provide you with all the information you need.
1a: Get the URL for the form by following these instructions.
1b: Cloning Your Form Via URL
-- OR --
2a: Cloning Your Form By Selection
I hope this helps. Feel free to contact us if further support is needed.