Bridge rectifier power source

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I am having problems with a bridge rectifier power source I built. I have traced the problem to the rectifier diode I am using. My voltage going into the diode is ~25 VAC. My voltage coming out as DC should be the same, one positive and one negative, correct? My multimeter is reading negative ~29 V DC and positive ~6 V DC. The diode was spec'ed as 8 amp and 400V tolerances. Is there a possibility that there is something wrong with my circuit (I don't think so), or is this just a diode that is messed up?

Thanks
 
Measuring across from the positive lead to the negative lead gives me ~37 V.

My drawing says coming out of the diode should be +22V and -22V but I am using a different transformer, therefore my numbers are higher. Shouldn't my positive and negatives be equal though?
 
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