Text in header shifts for different webpages

Hi I have hardcoded a text into header.php in the child theme.

I have styled it accordingly to how I would want to position it. It should appears as it should as seen in my homepage here

Here’s the problem: The text shifts whenever I click onto a different webpage within my site. If I click the menu ‘Health Info’, the text position goes bizarre!

Please help me solve this problem. I don’t know what is causing this.

Thanks in advance!