What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
I am not entirely sure what happened, but can you please try changing the input type again?
Let me know if the problem persists thereafter.
Create a matrix, try to change its property input type and you're going to find out what happens,
There's one create on the bottom, look it display inside the text box "undefined".
Thanks for the explanation and for sharing the form URL.
However, after checking your form I was not able to find andy Matrix table on it, so please make sure to share the URL of the correct form so that we can further investigate. Now, I made a test with one of my forms, but I did not get the same issue like you:
So, did you already try removing the matrix and readding it? if not, please give it a try, that may help.
Please inform us if the issue still persists.