Page transition glitches from time to time

Hey guys! For some reason my page transition is glitching from time to time. Like every 4th or 5th click to another page. I am not using any initial states. Basically when you click the transition goes from left to visible. And when you are on the next page, the transition is visible by default and just goes to left side. But for some reason from time to time is glitching and I am not able to fix it… Any ideas?

Thank you in advance!

Here is my site Read-Only: