I don’t think it is a big deal helping him make out his bills, unless it is a big deal to you. I mean is it enabling? Its not enabling drug use, or deviant behavior. But, I guess it really depends on how far down you want to drill. If your thinking its enabling him to avoid adult responsibilities, or facing an issue regarding coping with his dyslexia, etc.
I know you are not living together at present, but you do share a daughter. I think because of that you will always have your lives entwined to some degree. Often in relationships one person will handle specific duties maybe because they enjoy it more than the other person, or they are just more efficient at it, etc. The ideal is that both people know what is going on, and can handle whatever comes along on their own if need be. The proverbial “getting hit by a bus” scenario.
It sounds like the financial situation is however mutual. He is providing you with resources above what would be deemed appropriate if it was handled through the courts. And in return, you are helping him in weaker areas. Just do what feels right for you, and dont overthink and drive yourself crazy.