The schism happened over Romans 13:1-2 "Let every soul be in subjection to the superior authorities, for there is no authority except by God; the existing authorities stand placed in their relative positions by God. 2 Therefore he who opposes the authority has taken a stand against the arrangement of God; those who have taken a stand against it will receive judgment to themselves." The Society changed its doctrine in 1962, that the authorities are the country and its laws. Romanians being under communis oppression back then thought, this was caused by a communist infiltration among the highest ranks, and some members severed all links to the GB, because they had no reliable source of verifying the information. Then it evolved to a full distrust to the core JW teachings. They stuck on the '60s level of the teaching, making them even more weird than the mainstream JW sect we know now.
A couple of their weird teachings: women always cover their head, when in public, they think, printing in color is against the Bible principles (because the Bible has no color images), and they call themselves "The True Jehovah's Witnesses".