The vast majority of the Dead Sea Scrolls were simply copies of books of the Old Testament from 250-150 B.C. But the OT writings were written long before that, so how would you know if the original writings were changed before the DSS documents were created?
... Above all else, the contents of the scrolls show the remarkable flexibility and variety of Jewish thought and practice and demolish any notion of a uniform “Judaism” at that time.
IOW, there was a variety of religious sects. Who is to say that the current Bible reflects what the original writings intended? Perhaps the DSS manuscripts were just one sect's perspective of the various parts of the Bible. Did they exclude some writings or change the wording?
.... The Dead Sea Scrolls also testify to a period of theological creativity, of social fissure, of intense expectation and passion within the wider perspective of Judaism and Christianity. The scrolls’ occasional contradictions betray tensions between the goals of personal holiness and national redemption; between human and heavenly redeemers; between faith and knowledge as the means of salvation; between free will and predestination; and between an anthropology of human holiness and an anthropology of human depravity.
Dead Sea Scrolls - Ancient Texts, Biblical Manuscripts, Qumran: The group at Qumrān has been identified with many Jewish sects of the time. Even though some scholars believe the community to have been a branch of the Sadducees or Zealots, most believe that they were Essenes. The group is...
www.britannica.com
So, there were contradictions. What was the truth and what wasn't? According to who? My problem with all of this is that there is no possible way to prove divine guidance from the time the 1st biblical accounts were created up to and including now. Which is not to say the Bible we know today isn't God's truth; those who believe it is are doing so on faith and there's nothing wrong with that.