Strange behavior of Yandex maps on mobile?

Question

JavaScript

Good day.
there is such a bydlocode https://jsfiddle.net/S1ashka/vf91soyv/
loads labels from my php script and displays on the map
sometimes there are no labels, sometimes they appear and should be drawn on an open map
on a computer everything works perfectly, but on a mobile (tested on ios) marks are not displayed until you move/zoom the map.
what could be the problem? Thank you

Answer 1

What iOS version?