To date, red light cameras are constitutional in Florida. Therefore, your city can legally penalize you for every single occurrence. Without knowing more, a challenge of your second violation may or may not be successful. However, an experienced Florida traffic ticket lawyer can certainly take a look at your particular case and give you a more accurate assessment. Good luck!!
Ignorance of the law is not a defense. With that said, ticket lawyers are probably the best investment you could make. As they often win these cases on technicalities. But if you go and try to fight it yourself, I almost guaranty you will lose.
Before you're handed a license, you take a test on the rules of the road. So, yes, your city can ticket each violation. A challenge of your ticket may be successful and it may not be. I suggest that you hire a local attorney handling traffic tickets before going to court if you decide to challenge the ticket.
Please be advised that my answer to this question is based on limited facts and offered solely for informational purposes. My answer does not create an attorney-client relationship. Maria E. Castagliuolo can be contacted at 727-698-3634.