The Septuagint (LXX), or a Hebrew text that is no longer existent, is what the apostles used in their writings as evidenced by their OT quotes in the NT that match the LXX, but not bibles translated from the Masoretic Text (MT), which is what those 30 translations were translated from. The MT was made nearly 1000 years after the LXX was translated, so that provided a lot of time for tradition to replace truth in some cases.