Strange site behavior when installing Yandex metrics?

Question

JavaScript

By clicking on take the test, the page with the test is loaded by iframe.
q665588f.beget.tech/1/index.html
Before setting the metric, it looks like this:

After setting, like this:

The reason is apparently that the left styles are loaded.
Highlighted in red in console.
How to fix?

Answer 1

Well, as a crutch, you can kill the height with an importer. And so you have to understand. The frame has a very narrow metric name. Did you register this or does the metric insert?
Why do you need a frame at all?

Answer 2

In the fancybox script, you need to specify the $('.fancybox-iframe') selector. instead of $('iframe'). helped me.