Whats going on with the moon?

My little sister pointed it out to me in the beginning of September.

the eclipse-y part is going up and down... not side to side...

I've never noticed it before... I didnt notcie last year... or... before that...

has anyone else noticed?
if...

not... go take a look... tell me if it is there too... and if its normal...

I cant stop thinking about it

Might be something to do with the far side of the moon, this link with a diagram might help:

http://www.windows.u...

The moon is fine...it's just doing what it's always done. If there was something wrong, you'd know about it!!!