Is this normal? Speeds start at 2GB then drop to 1.5gb

Link to the speedtest i did that shows how speeds drop. Note: Im using wired conection with a Cat 8 ethernet using the 2.5gb ports for both endpoints. https://imgur.com/a/4ntj7V7

I have the gigabitX2 plan and speeds are perfectly good for upload but download i never get a consistant 2GB. I currenltly using just the XB8 Gateway. Is this a gateway limitation or something else?