Image effect flips camera upside down?

For the record, this is my ImageEffect code + shader.

So, I have this ImageEffect that fires when the player takes damage to glitch out the screen, and for a while it was all good, but now it's flipping the camera upside down, even when glitch != true. What I thought brought about the problem was adding a Bloom effect onto the UI camera, but even when I remove that ImageEffect from the UI Camera, it still flips the screen. I know that this problem arises because of the way DirectX and OpenGL handle texture coordinates differently, but even putting in

Code:

			#if UNITY_UV_STARTS_AT_TOP
			if (_MainTex_TexelSize.y < 0)
				o.uv.y = 1-o.uv.y;
			#endif

didn't help anything.

Do you guys know what's wrong? I'm really bad at shaders/ImageEffects.