My Adobe Portfolio website: hughadams.net, has issues with moblie devices. The text does not show up aligned as it does on the computer. Adobe says its because its how they scale text on mobile devices: see attached.
Your actual site looks just fine to me. See screenshot from Firefox in responsive mode. I also tested it on a 7th generation iPad, Safari 13.1 on Catalina without problems. On which devices & browsers are you seeing problems?
You could try swapping out the Header Text with an image. That will keep your text constrained to two lines. But your image will be significantly smaller on phones.
you saw the reply I got from the Adobe Portfolio support. Unless you know of something specific going to all these websites would seem to be not much help.