play button icon issue after captivate publish

Yeah - I don't like that play button either.

Here is a post that can help you bypass that play button screen.

Please note that it will not fulfill the interaction requirement of the browser for any audio you might have on slide one but it will present your first slide to the intended audience.

https://community.adobe.com/t5/captivate-discussions/so-you-re-looking-to-get-rid-of-that-white-screen-with-play-button-eh/m-p/10780736#M275893

That is actually quite normal nowadays.

See this article for the reasons: https://helpx.adobe.com/captivate/kb/captivate-responsive-courses-not-autoplay-browsers.html