Is the marriage contract between the questioner and her husband Islamically valid, given the surrounding circumstances, such as her father's initial approval followed by his retraction, the approval of her paternal uncles and the rejection of her maternal uncles, and the fact that her husband's father was her guardian in the contract?

The marriage must be annulled if it was contracted in imitation of the Abu Hanifa school of thought, and the contract must be renewed with the guardian's permission and in the presence of witnesses, due to the prevalence of the majority opinion. If a Sharia judge rules the marriage valid, then it proceeds and is binding. The girl is not obliged to obey her parents in not marrying a suitable man unless there is a legitimate Sharia justification. As for your uncle, he has acted improperly and must not ask your husband to divorce you. We advise you to strive for reconciliation between you and them.