Why is Tonks clumbsy?

[vmonte]

No: HPFGUIDX 111638

Lawless wrote:

Now, I /want/ to strike out B because she mentioned that she was 
clumsy in her Auror tests. But that could always be a cover-up. B 
still has a problem, though, because she would still be clumsy in her 
male "spy" body for a while as she readjusts again. So instead of one-
clumsy form, one-not we see in example A, we have two clumsy Tonks in 
example B.

So yes, I would lean towards A being an explaination, over B.
Now, I don't bring up these theories of Tonks in a sense that she's
ESE!Tonks hiding this from the Order. I don't doubt Tonks's 
loyalties, but that clumbsiness has been nagging me greatly.

vmonte responds:

You make some good observations.  Thought that the reason why JKR 
made Tonks so clumsy was because in either book 6 or 7 someone else 
was going to take her form and impersonate her (someone who moves 
elegantly--and Harry would notice), or that Tonks would take the form 
of Harry or another character and be found out because she is such a 
klutz.  

vivian