Portal 2 info_placement_helper
I am new to mapping, so I dont know if this is definitely a bug or not, but I have created a test map where I test new things that I dont quite understand. I have created an angled surface with an info_placement_helper on it.
When I fire a portal at this place, it goes there not a problem. But every time I walk through the portal placed on that surface and the other placed anywhere but ground level, I get shot through the portal. I have uploaded a video to youtube, so you can see what I mean. All other portal placements work fine.
In the console, type sv_player_funnel_into_portals 0
Unfortunately this has no effect on what is happening.
could you upload the vmf file? that way we can look into your map and maybe see what's wrong 
The file as requested is below. I also included the bsp as it is compiled on my pc.
from what I've seen your placement helper is a few pixels in front of your surface, try to make it so that the blue and green lines are IN your surface and red is sticking out, that might solve your problem
Try setting the radius of the placement helper to 20
Unfortunately neither solution works. But what I did notice is that when I place the portal any where but on the centre of the angled surface, using the heler to place it, it does not fling you through the portal.
I had this problem too when I was making my map. The only solution I know is to move the whole panel some units up. The player should not be able to walk into the angled portal, but have to jump into it.
Hmm I have edited the map and kept the original set up, but added a copy of the platform and angled it ever so slightly different. I do not get flung through the portal placed on here. Any ideas why ? VMF is below.