I can’t believe I never noticed that footer issue! Usually it’s the other way round, that I’ve stopped noticing those minor design issues. I’m sure they add up for new(er) users though and might result in a bad first impression. For many of us, though, this design is still the New Design ;-).
You might be right that the units should only appear once here. I don’t think the issue is that the number “floats” when the unit gets deleted; otherwise the number would have to “jump”?
It always surprised me that nobody chimed in on Inconsistent tab-navigation on dashboard. It was only recently added to the issue tracker, so it’s definitely still on the radar.