Did anyone had a situation after entering the portal that it didn't teleport you, but you were in some different space with purple color and you had to move forward to be teleported? I had this once on the DM2 map. I tried to repeat this, but I never succeeded.
That should be a known bug on a specific teleport that exists on the DM2 map. Not sure if it's also present on "regular" Quake but it's been on QuakeWorld for as long as I can remember. On the backroom (where there is Red Armor and Mega Health) there is a teleport that goes to the main (BIG) room of the map. If you jump just before the teleport and "aim" your jump so you go in the top left corner of the teleport, you…
I was really confused when I hit that.