This response is based on the information provided.  We suggest you discuss with your contracting team, program manager and/or legal department as appropriate.

We need to note that ECMRA has been deactivated and contractors are to load this information into the  System for Award Management (SAM).  Ms. Lord signed a directive changing the process for collecting manpower data at the beginning of FY20 .

https://www.acq.osd.mil/dpap/cpic/cp/docs/New_Contractor_Manpower_Memo_16_Oct_2019.pdf

The Federal Register

https://www.federalregister.gov/documents/2020/06/05/2020-11754/defense-federal-acquisition-regulation-supplement-data-collection-and-inventory-for-services

identifies discussion related to a proposed DFARS rule on ECMRA (DFARS Case 2018-D063)

We suggest you request your contractor identify for you where/when the loaded the required data for the SeaPort contract.  From the contractor response, you should be able to go into SAM to see what it loaded and how it matches with your understanding of the contract's/task order's expected performance.