I ended up working with TurboTax support on this issue. It looks like a glitch in the software accidentally copied the TIN from my first employer's W-2 form to the second employer's W-2 form. Because the software uses the TIN to aggregate the W-2 information, it then combined the values across both W-2's, even though each was really from a different employer.
My recommendation to you is to open up each W-2 and validate that the TIN is correct. My hunch is that both W-2's will have the same TIN, but when you fix the one that is wrong, it should recalculate everything. Once I re-updated the W-2's TIN the issue went away and hasn't come back.
