Comment form issue on Android smartphones

Hello!

I noticed that there are some troubles on Android smartphones when clicking on comment submit button.

Actually, the comment is not validated and after cicking on submit button the comment form is displayed once again!

In order to get the comment validation, submit button must be clicked one second time.

It is quite weird!

By the way, in case the last word of the comment contains some letters with accent or some punctuations such: . ! ) … then submit button works well!

I do not know what to do … Thank you for your help!!

My website: bio-transition.com