Tested on the 10.2 sim and it still submits:
So far, this is impossible to reproduce. Any other information would be helpful.
You guys are awesome. I really appreciate your efforts. Here's exactly what I'm seeing:
If there is anything else I can provide, please let me know. I'm sorry I don't have anything more technical, but this is all above my level of understanding.
Just an update - I cleared my cache and cookies on Safari and the form now submits. Just worried that the form could fail for some our returning visitors.
I did test with a known lead with the same correct result. I dunno, but I don't see anything out of the ordinary in the form behaviors (no special API JS). Be happy to look into it more if you see it again.