When initially opening the page it had broken colors in light mode. For anyone else encountering it: switch to dark mode and then back to light mode to fix it.
I think this has just been fixed. A bit of dark mode was leaking into light in the css.
Fine in Firefox on Android. Note that the scales of the charts are all different, which makes them hard to compare.
Also, there are lots of charts without comparison so the numbers mean nothing...
White text with light background, yeah.
I had the same problem (brave browser)
Looks fine to me on Edge/Windows.
Broken on iOS Safari too
I suspect the website is vibe-coded, like the tool itself.