Two identical websites, one doesn't work

I have two websites that I’m testing something on. I have a php script that my website accesses to send some info to an email and this works on one of my websites, but the second website (which is identical to the first, same html/css/php combo) doesn’t want to work… I don’t know why.
the two websites are:

please look at the form on the bottom-right of the page where it says “get in touch” and try to submit (you don’t have to input any info) responds with “invalid email” however doesn’t do anything.

thank you, looking into it now