We released updates to Views/Blocks and Forms today, can you check with those updated versions if you still have the problem?
If so, we'd need access to your site to see the problem for ourselves.
I will mark your next reply as private so that I can get log-in credentials from you—you may want to create a temporary admin user for me to use that you can later delete. And be sure to have a current backup of your site.
I have done below modifications in your website, edit the post form: hidden link
line 144, change it from:
"options":[[wpv-view name='json-output-competition']]
To:
"options":[[wpv-view name='json-output-competition'] ]
Just add a blank space between the last two "]]", it should be able to reset form's cache, please test again, check if it is fixed, thanks
How can I clear the cache? I don't think I have to clear the browser cache as it is backend generated. I tried to place a blank space in the code, it works, but I remove the space, it doesn't work again, I think is it not only the cache issue.