Client animation not fully functioning, and not in synch with host

Hey guys!
I have some cool little animation for my switch wedgit.
But one day it just suddenly cracked on the client page(only the first switch has problem)
The “Sustain” button should have a white "border" showing up(actually a box-shadow) in the end of the animation, that part is fine, but the thing is, the border just suddenly dissappeared after the animation is done... I've tried "forwards" for it, but still not working....(it seems fine on the host page tho)
I think there's a small bug cuasing this.....

It should look like this when the animation is done:

But the "Sustain" button is just wrong:

Here's my session file (289.1 KB)