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What am I not seeing?

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Okay so I am setting up collision detection in a very basic XNA game. The way I am doing it is checking if there should be a collision, and if there is check to find out what side the collision occurred from. The top and bottom collision works, but right and left wont work. The logic for top and bottom is the same for left and right so I don't understand why it wont work. Can anyone see what I might be missing?

//Call collision;
if (platCollision())
//From top
if (prevPos.Y + frameSize.Y <= platPos.Y)
texturePos.Y = platPos.Y - frameSize.Y;
//From bottom
if (prevPos.Y >= platPos.Y + platDim.Y)
texturePos.Y = platPos.Y + platDim.Y;
grav = 0;
//From Left
if (prevPos.X + frameSize.X <= platPos.X)
texturePos.X = platPos.X - frameSize.X;
//From Right
if (prevPos.X >= platPos.X + platDim.X)
texturePos.X = platPos.X + platDim.X;

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