This is a bug report of Brigitte shield.
Apparently when you use the shield the general hitbox increases massively and if you’re close (but much farther away than normal) it teleports you into Junkrat’s traps.
I’ve also noticed that the shield generally works badly.
You can’t block (or do it excessively badly) explosive traps in the air,
It doesn’t work well against Rein’s ulty either.
So I think the problem is that instead of creating a hitbox for the shield what the game does is increase Brigitte’s one, and add the shield points to her life, tracking if the shots come from the front.