Workmate WM425 vertical clamp truly vertical?

I bought a WM425 and have a question about the vertical clamping. I find that once I pull the lever and make the bottom plank vertical, there is a small horizontal "play" in the panel and it does not stay rigidly vertical. (It tilts backwards slightly by 1/8 inch at the top of the panel.) Therefore when I clamp something, the vertical panel tilts backwards slightly and is not truly vertical. Is this a "standard" feature or does it look like a defect I need to get fixed? thanks - Ram.
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Your first sentence is your answer,It's made by Balckened Pecker isn't it?

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I bought the same model today and had to take it back for a replacement. When I went to assemble it the wood work surface had a huge amount of mold or a fungus growing from it!!!
First time I have ever seen something like that
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