The method of computing weighted variances is spelled out here:
http://support.sas.com/documentation/cdl/en/proc/59565/HTML/default/a002473330.htm
Without seeing your data (don't post it if it is a large data set), there is no way we can explain what happened when you got a weighted std dev of 44. I will guess that one of your weights is very large compared to the other weights, and that it might be associated with a value that is very far from the mean. Do you have any major outliers in your data?
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