Condo association late fee seems unfair to owner

I was late making the condo assessment monthly fee in April of $315.00 In May I was charged a late fee of $50 for non-payment in April. I have since paid on time for May through the present. But, I still have not made the payment for April. Each month I am being charged a late fee of $50. That is $250 in fees being charged for late fees! Is this legal? I could understand interest charges, but this seems over the top to me. Pls let me know your thoughts.