misagreement

When the number (singular vs plural in subject and verb do not match. or when the tense of verbs in a sentence does not correspond (less commonly used in this sense than disagreement)

The misagreement in number (singular vs. plural) between subject and verb is caused by subject number ambiguity, either intrinsic (the subject itself) or extrinsic (the effect of subject modification).

An apparent agreement that is flawed in its formulation, or entered into with misunderstanding of or inattention to its intent or details

But misagreements often just come from the desire to agree.