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I was able to reproduce the problem on the form https://www.jotform.com/61443838457161
The Matrix field input box when set to Numeric Text box type is behaving like it was a Dropdown list instead.
I have submitted a ticket to our higher team support to fix this. We will notify you here for any updates/news on the status when available.
The problem has been fixed. However, you need to clear form caches to see it working. Thanks for your feedback.