Redirect after submission is not working after a few submission

Redirect after submission is not working after a few submission

I have setup redirect url correctly and everything works as expected.  However, it seems that there's a limit to the number of submissions before the redirect stops working.  

After the "limit" is reached, the page redirects to a seemingly zoho hosted page, but not the page specified in the form creator.

Is this a limitation of being on a trial account or is this a bug?

    Nederlandse Hulpbronnen