Anyone who has ever taught, practiced, or viewed closely an art or sport where balancing is involved (ballet, modern dance, gymnastics, yoga, martial arts, etc) knows that one leg is ALWAYS better than the other. It's just how we are. Some people are better - through practice of using both sides - better at using the body symmetrically but none are perfect. If you watch a gymnastics meet, martial arts form work, or a ballet performance you will notice that none are truly ambidextrous - all favor a leg or a side - almost all turns in a ballet are to the right, gymnasts push off the same leg every time, on and on. Why should you, who does not as a rule, intently practice balance every day be any different?
I wouldn't worry about this unless it's causing you some sort of difficulty in day to day life (in which case you might want to try some balance exercises).
I know strength testing and all the funny things we do trying to reassure our worried minds that we can still do these things, brings some immediate comfort, but please keep in mind that your muscles and tendons are not used to being put under the repetitive strain that you are putting on them when you do these things. These are things that only a doc has you do a handful of times in your lifetime and here we are doing these things daily, some of us are guilty (me) in the early days of doing them several times a day. Your muscles will revolt trust me, and then you will be convinced that you are becoming more symptomatic and really all it is, is your muscles and tendons telling you that they are really peeved at you 
So go easy with these test, and if I was being totally assumptive, my apologies, I just wanted to put it out there because I have witnessed what comes of the constant strength testing and was just trying to save you the grief I brought to my muscles and tendons in the early days of this.Take care EdRobynn 
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