I believe that it is something normal that happens to any author and much more to those of online novels, also I believe that this is one of the reasons that differentiate us from conventional writers.
As some have said in the comments above, it usually happens that the more chapters you write, in addition to having more experience you continue to improve in your writing, you realize how badly you did before, otherwise with conventional writers, they write the complete book and you can change things as you develop it and after finishing it, other processes follow to improve weak points.
Most online authors have a general idea of their novel and as they write the chapters they publish it