This method of synthesizing benzaldoxime, if properly carried out, gives a practically quantitative conversion of the aldehyde to the oxime (reflux, TLC control).
So you must have made some fatal mistakes in the synthesis, isolation, purification, or interpretation of the NMR spectrum. Based on the information provided (or rather the lack of it), I can guess all possible errors.
If you want real help, you must provide all the details of your procedure and the NMR spectrum.