Markers don't display

[cplaiu]

Hi, I have a problem with rendering of markers.
Sometimes they appear and others do not.
I have an ajax that returns the content to show it later.

https://cdnjs.cloudflare.com/ajax/libs/video.js/6.3.3/video-js.css
https://cdnjs.cloudflare.com/ajax/libs/video.js/6.3.3/video.js

What could be the problem ?

[logdone]

The same problem happens to me.
To produce it I play the video as fast as I can (The add marker function is on the ready function "videojs('video').ready(function(){ ")