I found two and a half bugs related to module searching.
1. When searching modules via Artist Search with "Guessed Artist" option selected, it appears that "Most recently archived" and "Least recently archived" sorting options in the "Change Order" drop-down list work exactly the opposite: "Most recently archived" option shows least recently archived modules first, while "Least recently archived" option shows most recently archived modules first. These two options are swapped.
Example:
https://modarchive.org/index.php?request=search&search_type=guessed_artist&query=Djamm&page=0&order=3and
https://modarchive.org/index.php?request=search&search_type=guessed_artist&query=Djamm&page=0&order=42. When browsing modules by license (
https://modarchive.org/index.php?request=view_by_license&query=publicdomain), the "Change License" drop-down list selector works as intended: it actually shows modules licensed under chosen license, the title above 6 browsing options ("Random", "New additions", etc.) displays chosen license correctly, but in two cases the "Change License" selector doesn't display the chosen license correctly:
1) when "Non-commercial" option is selected, it says "Non-commercial No Derivatives";
2) when "Non-commercial Share Alike" option is selected, it says "Non-commercial".
In other cases, the "Change License" selector works fine: when "Non-commercial No Derivatives" option is selected, it says "Non-commercial No Derivatives"; when "Share Alike" option is selected, it says "Share Alike"; etc.
2a. There are, however, several modules that are not licensed under chosen license, but they still appear in search results. Only two examples are illustrated.