Hi there,
I read from your profile that you are 61? that would put you in a higher risk category when it comes to exercises due to high BP, etc.
The leaky heart valves that your Doctor refers to: Barlow's Syndrome. It is very common and 20% of the population has it and does not need any intervention/treatment, unless it causes alarming symptoms or heart failure.
But, with any exercise or diet, it is highly recommended at your age to consult your Primary Care Physician/GP first.
Take care and let us know how you are doing.
All my heart valves are a little leaky, and my cardiologist told me that in general, that is pretty normal, especially as we get older. The leakage from 3 of those valves is described as trivial and completely unremarkable. I have only one valve that should NOT leak (the aortic), and that earns me a yearly stress and echo test. However, since the leakage there is "mild-to-moderate" as well as stable, the doc always tells me to go ahead and exercise my buns off.
It is pretty reasonable to assume that since you did NOT get a warning from your doc not to exercise, you are fine to continue your zumba classes.
However, why not just call your cardio in the morning and ask your question? A nurse will consult with your doc and get back to you in a day or so, short-cutting all the waiting.