Text getting cut off on smaller breakpoints


My subheading is getting cut off on mobile breakpoints. I use the same class on different headings within the same breakpoint and some headings automatically fit while others get cut off.

Does anyone know why this happen?

Here is a link: https://preview.webflow.com/preview/apextuitionaustralia?utm_medium=preview_link&utm_source=designer&utm_content=apextuitionaustralia&preview=8388ca069399ccfeebb84275a77e7f58&pageId=5e9f9f4281f2df5c7e4b87cd&mode=preview
It’s on the page called Who is Apex?

Thanks in advance