Lease on mortgage states 60 years on Land Transaction Return form, but was promised 125 years?!

Regarding a purchase of a flat. On the Land Transaction Return form in the section about new leases it states the start date is 1976 and end date is 2075, but I was promised 125 year lease! I was told there are two leases running together- one from the freeholder and one from management company for the new flat contract. And that the 125 year one was with management company. Should I be worried if on this form it states the new lease's end date is 2075. Or is that the one from the freeholder? Completing tomorrow so worried!

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