The right-of-use asset and lease liability are not equal throughout the life of the lease, as the calculations to amortize each balance to zero are entirely different.
Deloitte clearly illustrates this in their ASC 842 guide, A Roadmap to Applying the New Leasing Standard, on p.327, which has a great example:
If you're curious to learn more to why this occurs, please read this article - How to Calculate the Right of Use Asset Amortization and Lease Expense Under ASC 842.