ignore does not work, or not work well

If I use `scancode --ignore "*.csv" --ignore "*.dll" --ignore "*.md" ` it is not ignoring all files.

And I found out this is because if I have a .csv file in the root it does not ignore .csv files anymore.
If I remove the csv file in the root folder, then it works.

Adding another .csv file in the root, it no longer ignores csv files.