Certainly if there was an abnormality in the anatomy of the testicle, this should have been found during the ultrasound. If you are concerned about this, it is certainly your right to ask what was found on the ultrasound.
I am unaware of the testicle "flipping forward" after the varicocele. I would suggest repeating the ultrasound if there is further concern regarding this.
Followup with your personal physician is essential.
This answer is not intended as and does not substitute for medical advice - the information presented is for patient education only. Please see your personal physician for further evaluation of your individual case.