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Scrollmagic calculates the start incorrectly

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I have the problem that only on mobile devices the start of my Scrollmagic animation is not calculated correctly. On desktop devices the calculation works without problems. It doesn't matter which browser I use.


URL: https://pechschwarzmedia.de/webdesign-agentur/


$('.animation-image_video').each(function() {
        var element = $(this);
            trigger: element,
            pin: element.find(".animation-image_video__media"),
            start: "top top",
            end: "bottom bottom",
            markers: true







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It's pretty tough to troubleshoot without a minimal demo - the issue could be caused by CSS, markup, a third party library, your browser, an external script that's totally unrelated to GSAP, etc. Would you please provide a very simple CodePen or CodeSandbox that demonstrates the issue? 


Please don't include your whole project. Just some colored <div> elements and the GSAP code is best (avoid frameworks if possible). See if you can recreate the issue with as few dependancies as possible. If not, incrementally add code bit by bit until it breaks. Usually people solve their own issues during this process! If not, then at least we have a reduced test case which greatly increases your chances of getting a relevant answer.


Here's a starter CodePen that loads all the plugins. Just click "fork" at the bottom right and make your minimal demo

See the Pen aYYOdN by GreenSock (@GreenSock) on CodePen




Once we see an isolated demo, we'll do our best to jump in and help with your GSAP-specific questions. 

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When you say "ScrollMagic" (not a GreenSock product), I assume you mean ScrollTrigger, right? 


This looks very odd to me: 


Why do you have the extra ScrollTrigger. in there? 


Beyond that, yeah, we'll really need a minimal demo to offer feedback/advice. It isn't feasible to troubleshoot a live site like that.  I wonder if you're just running into something related to the address bar showing/hiding on mobile devices(?) 

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