Those videos doesn't work on your template. I think IV doesn't fully support YouTube IFrame Player API. It's not YouTube bug, here is simple example of working iframe with the first "Sleep as Android" video: https://codepen.io/anon/pen/jdZvgX, which doesn't work in IV. So, IV doesn't fully support this videos. According to the Checklist, paragraph 3.3: "Check that pages that feature unsupported content do not generate IV pages.". That's why this page shouldn't generate IV.
You are right. If there are more than two videos a page, it stops working. I fixed it in Template #14.
Accepted by admin
Type of issue
IV generated for non-target page
Reported
Feb 9, 2019
Log In
Log in here to create Instant View templates. Please enter your phone number in the international format and we will send a confirmation message to your account via Telegram.
So, IV doesn't fully support this videos. According to the Checklist, paragraph 3.3: "Check that pages that feature unsupported content do not generate IV pages.". That's why this page shouldn't generate IV.