Shipyard Questions

I have noticed a couple of things when trying to design a ship that seem odd.

The first screen snapshot below shows the description for "Hull Support".  At the top it says "+4 Hit Points" but right below that it says "+ Hit Points 6".  Is it 4?  Is it 6?  Is it something else?

The second screen snapshot below shows the description for "Hull Reinforcement".  At the top it says "+4 Hitpoints and +20% Hit Points" but at the bottom it says "+ Hit Points 6.8" and "+ Hit Points 20%".  The first minor issue is combining Hit Points together into one word (Hitpoints) at the top.  The second issue is trying to figure-out what I am going to get if I add Hull Reinforcement to my ship design.