submit button won't respond

Hi Hi,
I’m trying to submit into a dataset, but the submit button doesn’t work properly.
Most of the time it’s just not responding, rarely it does upload (with a success message), and almost never shows a fail message.
I saw the pictures I upload in the “visitor file” section, but the dataset is not updated.
What may be the problem, and what can I do to solve it?
Thanks, Ronen