What is the reason for the lack of logical order in the verses of the Quran, the fluctuation of topics, and the fact that the names of the surahs do not encompass everything mentioned within them?

The phrasing of the question contains insolence and audacity towards the Book of Allah. The polytheists of Quraysh did not dispute the Qur’an because of the order of its verses or the naming of its surahs, as they were the keenest people to belie the Prophet, peace and blessings be upon him. The arrangement of verses within the surahs is divinely ordained (tawqifi) by scholarly consensus, and it is one of the miraculous aspects of the Qur’an. Every verse has a connection to what precedes it and what follows it, even if this is not apparent to everyone. The names of the surahs are not all divinely ordained (tawqifi); their purpose is to facilitate review and study and to distinguish one surah (definition) from another.