There is/was a problem with the third portal were It plays the animation as if you've gone through it but you're left where you were still facing forward as if you've just passed straight through it.

I've checked the Entrance and exit Id's and they're fine, I'm pretty sure what's happening is it's sending you to the exit then back again. At this point

What I could do is make it so you can't travel back through the portal. But then you can't go back should you want to.(don't know why, it's much more fun forward)

So what I have done is decrease the range of the exit portal So you have to be more towards the center to activate it.

I tested this a few more times while I was making other changes to the level and it hasn't happened since.

Hope this all makes sense and that it actually works now.

P.S. I have a problem where if I push my graphics to far I go straight through the first portal and smash into the blocker, something to look out for :)