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Problem after signing in with Vanilla Universal Comment

I successfully installed Vanilla 2.5 into my website.
Trying to embed the Universal Comment into a web page.
Yes the comment form is displayed ok, but after logging in I see the double content in the page (see the attached picture).
I have to refresh the page in order be able to write the message.
Here is my test page:
https://uncalceneng.com/testpage.php?pageid=1
My Forum URL is:
https://uncalceneng.com/forum
I am on Apache 2.4.29 and PHP 7.1.
Please advice
Thank you
1
Comments
Seems the page is experiencing loop refresh
I think I have a solution for this issue.
Based on this clue "break out of iframe":
https://open.vanillaforums.com/discussion/25850/how-to-break-out-of-iframe-in-an-embedded-forum-upon-sign-in-or-sign-out
I put the script below in my page and it solves the problem.
https://gist.github.com/darryl-snow/3820304
Thank you for Yoast for the comment.