UPDATE: That 'extra' backup on 2/20/14 is now gone. The furthest one back is now 2/21/14; seven days.
Another interesting piece of this puzzle is the times of the duplicate updates (Listed in the order they appear in the 'timeline'):
2/21 Normal: 8:09am
2/21 Dup:... 3:08pm
.
.
2/24 Normal: 7:57am
2/24 Dup:... 3:57pm
-
2/25 Normal: 7:14am
2/25 Dup:... 4:14pm
-
Yesterday
2/26 Dup:... 5:26pm
2/26 Normal: 5/26pm
Looking a bit closer, I see that today's backups, except for a single one, all have a silver/grey color. The MBP has been asleep since soon after it automatically started up this morning. I'm now wondering if this 'normal' when the machine is sleeping? I would think that Time Machine would not run during a 'sleep' cycle. Perhaps there is some app running in the background that is also creating/modifying a backed up file?
Is this something I've just never seen but has been there all along?! At least in Macericks?!
Curiouser and curiouser...
I've downloaded a Widget (and an app to allow it to run on the desktop - I stll keep Dashboard killed!) and it may help to look at TM logs with it.