Their witness agreed not together (isai hai marturiai ouk è„san). Literally, the testimonies were not equal. They did not correspond with each other on essential points.
Many were bearing false witness (epseudomarturoun, imperfect, repeated action) against him. No two witnesses bore joint testimony to justify a capital sentence according to the law (Deu 19:15). Note imperfects in these verses (Mar 14:55-57) to indicate repeated failures.