ANSWER:

No need to repeat any of it as long as you did your best or this would open the door for satan to make you repeat everything else later on.

During dhikr after salat, when we subhanallah 33 times and then the rest if we have a doubt with the counting or if we are satisfied with the alertness with which we did the dhikr , can we count it again.. and if we feel problem with alhamdulillah ONLY , then is it enough to repeat only that?