In reply to Coco.

Without knowing the details, I cannot advise. You might want to post your code to the SAS Support Communities.

It is possible that you have a mistake in your bootstrap code, which is causing the situation you report. Another possibility is that synthetic data is small and/or not representative of the population. If the observed estimate is far from the parameter value, then it could be the synthetic sample is not representative. To see if that is the problem, increase the sample size (maybe N=200 or 500?) and try again.