After looking at your page I found that your header container has max-width property and your text section does not, so for bigger screen sizes your text section’s width increases but your header stops at 1200px. To fix this you can either remove the max-width from your header container or you can give max width to all your section. I would suggest the second option as it is best practice. Also when you need to add same amount of right & left padding to your header section as per your text section , currently it is 50px.
Screenshot:- Screenshot by Lightshot
Hope this will helps you out. Please mark it as Solution Accepted & Upvote to help other Community member.
Thanks!