Only debt incurred prior to 10/14/1987 is considered Grandfathered Debt per the IRS. Per Publication 936 updated for tax-year 2021:
Grandfathered Debt
If you took out a mortgage on your home before October 14, 1987, or you refinanced such a mortgage, it may qualify as grandfathered debt. To qualify, it must have been secured by your qualified home on October 13, 1987, and at all times after that date. How you used the proceeds doesn't matter. Grandfathered debt isn't limited. All of the interest you paid on grandfathered debt is fully deductible home mortgage interest.
You may have entered the 2017 loan origination date in error for your 2020 tax returns. The current loan origination date should be the 2020 date and if the outstanding balance on the mortgage is over $750,000 if you are filing Married filing jointly.
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