Regular Tuff stairs, slabs and walls don't match the other tuff family blocks when walking

When walking on the regular tuff stairs, slabs and walls; the sound created is the sound when one walks on stone or cobblestone and doesn't match the sounds of the newly added tuff block family.

Note: The regular tuff has the matching sound but regular tuff stairs, slabs and walls doesn't.

The first two vid shows ** the similar sounds ** of regular tuff and the new tuff bricks and the latter two shows that the tuff bricks stairs and slabs has the same sound while the regular tuff stairs and slabs doesn't 

I couldn't film the walls but the same goes for it too.