Why is my custom form being sent 3 to 6 times when someone fills it out, and then it says it hasn't worked? It's been working fine for years.
Stud Dog Central is the site. Here's the link to the List Your Stud page: http://www.studdogcentral.com/AA-ListYourStud.html
I just tested your form by putting my own email in there and sent a test submission. I only did receive one, so one thing I would check is that if you have that email connected to email clients like your phone and outlook, they need to be IMAP. You would find this in the settings. If one is POP and one is IMAP, that can cause emails to duplicate.
I recommend changing the password for your email address. Email client connections are the only thing that causes that issue that I've seen, so changing the password will disconnect any that you do not know about. Please update the password and let me know if you receive any more duplicates.