Deeds are notoriously inaccurate with respect to the actual acreage. More important is the metes and bounds description. As long as the parties agree that these boundary references are accurate, there should not be a problem. You can always hire a surveyor to double check the boundary descriptions and then to calculate the acreage.
This answer is provided for informational purposes only. Actual legal advice can only be provided in an office consultation by an attorney licensed in your jurisdiction, with experience in the area of law in which your concern lies.