It is my understanding that in 1868 the States of New Jersey, Oregon, and Ohio withdrew their ratification of the 14th Amendment. But they were told that they had no such right, that if you voted for ratification, you could not take it back. Yet the Southern States which voted "no" were put under military rule until they changed their vote to "yes" ... so the rule was that if you voted "no" then you could change it to "yes", but if you voted "yes" you could not change it to "no". It sounds arbitrary to me.
My thinking is that an amendment does not become binding until ratified by 3/4 of the States, and so until that time, a State can change its vote because it is not bound otherwise.