Florida condo owner has questions about rental process

I own a condo unit in a Florida Condo Association, and decided to rent it out for the winter season.

I sent $100 to the Condo Association Board for the background check and application process for new renters. The Board has approved the renters, but required a $2,500 security deposit to cover the common grounds area. I am aware of other condo unit owners renting, and having to pay either zero or $100 total.

I’ve argued that this was selective enforcement, after which they lowered the deposit amount to $1,250. Is this legal?  My renters are a nice elderly couple that have rented in our Condo Association the previous two years and have a perfect history.