That is quite normal IME.
No strop is 100% flat, and so you will see those kind of things when holding your razor on the strop.
Once you start doing an x-stroke with a minimum of speed and give in the strop, your entire edge should get a proper stropping.
The give on a full-lenght strop should in my opinion be about a half to a full inch.
Or thereabouts.

Try it out
Oh, and do search out the stroptober thread too.
That is filled with good info on stropping.