The title might be long-winded, but the request is simple.
The Type section has square check boxes, which implies you can select multiple of them at once, which is not the case. Changing them to a circle-box, like the inversions, would help show that you can't have a I7,9,11 chord.
Similarly, change add9 to a circle-box to reflect how it cannot co-exist with the sus4 or sus2 options.
The Sec section should get the same treatment. You can't borrow the i chord from Minor and then make it V/i.
This will all be fixed in Hookpad 2.