epub locations not sequential

This is my first time using Scrivener to create an epub file, so maybe this is normal.

I created an epub file, and used Kindle Previewer to test it.
Everything looks fine, but as I go from page to page, I see the ‘location’ skips a few numbers.

For example, one page is ‘Location 508’ and I go to the next page it’s ‘Location 520’, the next page is ‘Location 532’.

Everything seems to work fine, I wonder if anyone knows how ‘location’ is determined?

I have noticed this situation. Not a problem, it’s a Kindle Previewer feature.