For some time now, I've been noticing a strange visual glitch with non-solid blocks like flowers, saplings, torches, etc. Basically, the texture of the block warps upward when looking at it from a certain angle. For blocks like flowers, extra tallgrass, and saplings, warping occurs at any corner except for sides, and for blocks like torches, you must be at least two blocks away and looking at it from the side (no corners). I have also included some images so you get a better understanding of what it looks like.
To me this only happened while running Optifine, so if you running Optifine it might not be a Minecraft glitch but an Optifine glitch. If your not running Optifine then... well I don't know