Frankly I'm puzzled by your description.
Compensation is created by the vesting of the RSU and that compensation is included in Box 1 and typically reported to you in Box 14 as ONE item. The only thing I can think of - strictly a guess - is that you sold some of the shares in a "same day" sale and kept some and the employer has, for whatever reason, split the vesting compensation into two parts?
I'd ask your employer to explain what this is all about.
