Why are the coordinates displayed with fractions in the Yandex browser?

Question

JavaScript

Hello! I am writing a website builder. Already wrote about 600 lines of code. The code was constantly checked in Yandex and Chrome. But suddenly fractions appeared in Yandex! You can see it on the screenshot - priscree.ru/img/d30d07c793ca0a.jpg
What's the matter? I can't post the code. What could be the problem? There are no errors in the console. Elements that receive coordinates are written to exactly elem.style.top, not offsetTop.
If you write exactly offsetTop, then everything works. But still the question remains open.