What do you mean by “changing the text”? Like changing the actual text? Making it say something different ? Changing what the text says is changing things in the DOM, in the HTML code, i’t not at all related to CSS, breakpoints and all that stuff. Only what’s CSS can be changed between breakpoints.
Changing the STYLE of your text in the vdo bg section on a lower breakpoint doesn’t change it on the upper ones (just tested on your project in case of).