This again is incorrect, canon II of Trullo accepts the canons of Basil without exception, and forbids anybody from transgressing or disregarding them.
But we set our seal likewise upon all the other holy canons set forth by our holy and blessed Fathers, that is, by the 318 holy God-bearing Fathers assembled at Nice, and those at Ancyra, further those at Neocæsarea and likewise those at Gangra, and besides, those at Antioch in Syria: those too at Laodicea in Phrygia: and likewise the 150 who assembled in this heaven-protected royal city: and the 200 who assembled the first time in the metropolis of the Ephesians, and the 630 holy and blessed Fathers at Chalcedon. In like manner those of Sardica, and those of Carthage: those also who again assembled in this heaven-protected royal city under its bishop Nectarius and Theophilus Archbishop of Alexandria. Likewise too the Canons * of Dionysius, formerly Archbishop of the great city of Alexandria; and of Peter, Archbishop of Alexandria and Martyr; of Gregory the Wonder-worker, Bishop of Neocæsarea; of Athanasius, Archbishop of Alexandria; of Basil, Archbishop of Cæsarea in Cappadocia; of Gregory, Bishop of Nyssa; of Gregory Theologus; of Amphilochius of Iconium; of Timothy, Archbishop of Alexandria; of Theophilus, Archbishop of the same great city of Alexandria; of Cyril, Archbishop of the same Alexandria; of Gennadius, Patriarch of this heaven-protected royal city. Moreover the Canon set forth by Cyprian, Archbishop of the country of the Africans and Martyr, and by the Synod under him, which has been kept only in the country of the aforesaid Bishops, according to the custom delivered down to them. And that no one be allowed to transgress or disregard the aforesaid canons…
The canons do not contradict each other, rather, they provide guidelines towards achieving the same end of saving one’s flock, which sometimes necessitates different approaches.*
I know that but Canon XCIII seems to contradict divorce, adultery and remarrying which I believe is contradicting St. Basil that allows them. That’s why it is pretty much confusing from a non-Orthodox perspective.