When I look at the code of your text, I can see that it's not just text but also some span elements:

Whenever you style parts of a text to be a different font family, the text editor creates a span tag around that part of the text to be able to style only that part.
So above you see, we have the word Hualula in bold. So that gets into its own span element.

Now the problem is non-breaking spaces work within texts that are not split up by other tags like span tags.
I think if you select your text and click the clear formatting button:

then the span elements would be removed, and the non-breaking spaces would work correctly.

If you would just want to