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Try a couple of things before you send them back.
First, open the molds and inspect them carefully at the pins and mold faces for debris. A tiny piece of slag could get in there and cause the whole mold block to mis-align. Check for burrs or anything that prevents the mold blocks from closing smoothly.
Then with the mold blocks on a smooth surface, close them and see if everything aligns. I have molds that mis-align sometimes and I find it helpful to set them on a flat surface when I close them to align the mold properly. Another thing I've learned is to close the blocks before I close the sprue plate. Sometimes the sprue plate will tap the blocks out of alignment before the blocks close completely. Another tip is to use a pencil and thoroughly coat the top of the mold block with pencil graphite. I use a carpenter's pencil and completely scribble all over the top of the mold block where the sprue plate swings. The graphite helps lubricate the sprue and seems to cut down on galling the tops of the blocks.
All that said, sometimes Lee sends out a bag mold block. If you can't get the block to align properly, send it back to Lee. In my experience they'll make it good.
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