Firstly on your NPM page: https://www.npmjs.com/package/gsap The link to the CDN link is wrong: <script src="https://cdnjs.cloudflare.com/ajax/libs/gsap/3.0.1/gsap.min.js"></script>   Secondly tweening between large numbers 0 to 300,000 produces a negative value, in the older versions of GSAP it's working perfectly.   Working version (1.20.4 OLD VERSION): See the Pen wvvEWoM by JoeCoulam (@JoeCoulam) on CodePen Latest GSAP