How to keep loans from a cash out refi properly segregated?

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My wife needed funds for her business and I extended 2 independent loans by refinancing our home mortgage. I need to track the original remaining mortgage of the house and the other two loans separately. They will all pay off at different points in time. I thought this was as simple as creating (3) separate amortized payment schedules for the amounts owed. After several years of this method, a spot check of total balance due from my schedules differed quite a bit from the mortgage lenders’ balance due. My amortized schedules are excel templates and should be accurate. Should I be rethinking my method of tracking, or is this the right approach and maybe I just have some error entries somewhere? Is there an excel template that segregates one amortized  loan into multiple independent amortized loans for tracking?

Thanks in advance.