Year in Date Field gone astray

How could this have happened?  Attached is the .csv download direct from JotForm. Original record was edited so that the transaction could be processed. I tried to reproduce this on the form but JotForm will supposedly only permit a four digit year.

Hm, that looks both interesting and perplexing at the same time. I have looked at your form, and there doesn't seem to be anything wrong with it. You are not using any conditions to update this field in any way.

I have tried reproducing it in multiple ways, such as tabbing into the field, or pasting a longer year into the field, but it just does not accept input of more than 4 characters. What makes your described occurrence stranger is that our year input field is using a HTML attribute called maxlength and it is set to 4. This lets your browser know that it should not allow inputting more than 4 characters.

As this seems like it's been an isolated incident, I am not sure what to think of it. If it happens again, please do let us know, so that we can investigate further and try to reproduce it as well.

Hopefully we won't be seeing any more of such occurrences. Please enjoy your day.