Its 6 slots, your medic sprite seems to have glitched over to your penny. If you look at the blue rings at the base of each sailor, you see a blue ring on the bottom of all of them except the medic.
Sometimes, when you put on a sailor into a slot and change to a different ship the sprite could remain there.
Hope that helps.
[EDIT] btw the medic will not have any effect on your ship :P
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