I'm currently dealing with this problem:
I have a form that I set up, that has some free-text fields, and some select/dropdown elements as well. The issue is that I get tons of illegitimate entries that contain the value of "0" on most fields (only for free-text fields, not for dropdown fields).
Here's a screenshot of the form's entries
... and here's a full view of one of these entries
Now, at first I suspected that it's spam, but I have enabled Honey Pot, plus, the strangest thing is that it is quite impossible to submit the form when the Email field is populated with "0" (the Email field is NOT a regular text field. I have selected the one that does verification - under "Advanced Fields").
Another thing I should probably note is that the IP address is consistent across all entries. And, if I were to submit the form regularly, the entry would look just fine (without the zeros).
When doing an IP lookup for that IP address, it says that the IP is associated to McAfee, which is very strange.
I am really unsure what causes this issue, but as far as I know it's impossible to submit the form if the email field is set to zero.
Thanks a lot for helping out!