Hi everyone,
I want to report a possible malfunction in the tool written in the title.
I have a large monitor that allows me to zoom a lot. When I reach a certain level of zoom,  the Ruler always shows a green square below the column like if I already had solved it.

I hope I described my issue properly.

Hi, I could not reproduce it. Could you, please, make a screenshot and copy of error message in web console if there is some?
Thank you, Ra100

https://ibb.co/VgJgfn8

After zooming, I made a mistake on purpose so that the red mark would appear. --> Pink arrow on the image.

Secondly, I moved in another area of the puzzle ---> the Pink circle on the right.

As you can see on fhe Ruler on left, the red mark appears on the wrong column. I can move everywhere and even fix the mistake on the fourth column but the red mark won't disappear.

I have to zoom out and then zoom in again to reset the mark.

I experienced the same behaviour when successfully completing a column. The green mark will appear on every column like the red one in the image (on the left).

Thank you for help. I found it and fixed it. In fact I have changed just two characters in source code.
Rasto