Level select bug that needs investigating

[Auroriax]

Describe the bug
On the page for Suikyo is the following warning:

Oops, the level selector works buggy! Don't use it! (When something is wrong, it keeps selecting the same level. If you really want to use selector and is not behaving nicely, please select a New Game then use the level selector. The save data only keeps the level you have beaten or not. So if you are not a perfectionist, it will not affect the game experience at all, so feel free to use the selector.)

Might want to investigate this since it sounds like an engine bug, or ask for more info.

Reproduction Steps

1. TODO
2. TODO
3. TODO

What did you expect would happen?
N/A

OS & Browser version, desktop/mobile
Might want to ask in case it's relevant?

Screenshots, example projects, other relevant issues, etc.
https://competor.itch.io/suikyo