Hello Mario
I've experienced the problem on two forms:
1.
www.atlas-suhr-valley.ch/frauenwochenende
2.
www.erlebnis-woche.ch/kontakt
The 1. is really a problem, because it is a sign up page that is used a lot at the moment. And they sometimes get many email in response to their sign up and there are many records in the database (Yesterday 26 for one sign up).
At the moment I've done the following steps:
- Added a submit button as a control, that submits the form as action. With this step I've removed your script. But this didn't help anything. It's still the same.
- Replaced the invisible reCAPTCHA V3 with a reCAPTCHA V2 "I'm not a robot". There was no multiple submition so far. Maybe this helps as a workaround.
The 2. is still untouched. I did all the tests with 1.
If you would like to do tests, 2. would be easier. I'm the only recipient of the emails and there is no productive maintained list.
I haven't seen the multiple submission from different browsers:
-> Mozilla/5.0 (Windows NT 10.0; WOW64; Trident/7.0; rv:11.0) like Gecko
-> Mozilla/5.0 (Linux; Android 9; CLT-L29) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/76.0.3809.89 Mobile Safari/537.36
-> Mozilla/5.0 (Windows NT 6.3; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.142 Safari/537.36
-> Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.100 Safari/537.36 OPR/62.0.3331.99
Thank you very much
Best regards
Andreas