Using Command + ` toggles ONCE through my Safari windows, but won't cycle BACK. Why?

Question

I read up on how to toggle through my Safari windows by using the Command + ` and it works fine to go forward, but it won't go back to the other window once I use it.
Example: I have 2 (two) open Safari windows, I use Command + ` to move to the other window, but once at that window, using Command + ` again will NOT move me back to my original Safari window.  Why? 
What keyboard shortcut can I use to go back/circle all the way through?  I know about using Expose' and other shortcuts, but I am looking specifically for a KEYBOARD shortcut. 
Thank you in advance,
mVice

Answer 1

Okay, I was sadly mistaken!!! The bête noire tis back!  It seems as if whenever I have a video playing within Safari, it prevents the window cycling to go past the window playing the video.
So lets say I have four windows open:
1=google.com
2=facebook.com
3=projectfreetv.com(home page)
4=breakingbad.projectfreetv.com(actual video). 
If I am on #1, I can cycle to #2, #3, and #4, but it stops after its hits #4, (actual video).  I then can manually click on #3, and it will cycle to #4, but then it stops.  If I manually click on #2, it will go to #3, but stop after #4.  If I am on #4, it wont cycle.
So, N.Hillyer, I tried your suggestion, but alas, if I am watching a video, it will not allow me to cycle past that window.  What is the deal?  And no, it's not just projectfreetv's website, it also prevents cycling from uverse.com, abc.com, mtv.com etc.  This is quite frustrating!  No matter how many times I clear the cache, once I start watching a video it prevents me from cycling :-(  Please help!
Thanks in advance,
mVice