Warped LP's

Exchange the defective LP. If the warp is minor and other than that the record is perfect, consider keeping it. 
I just bought a brand new Cassandra Wilson Blue Light Till Dawn directly from blue note and the 2nd LP has a minor warp. I requested a replay which was sent promptly but it has the exact same issue. I won’t bother replacing it. It’s too minor and other than that great record. 

Played through the whole album and as stated before, it seems ok, so I will keep it.

But I almost tripped out when I got to side D or what I thought would be side D.

At first, it didn't look right to me and I thought, oh no, this is defective also and will need to return.

But then I quickly realized that how the album is, it doesn't have a side D. I have never seen a double LP with only 3 sides to play (live and learn I guess).

Side D is just an image without any grooves. I thought that was interesting.

I have many 3 sided LPs.  Most of the time this occurs on vinyl reissues that were originally issued on a single CD.  Since a single CD can hold over 80 minutes, conversion to LP (which can generally hold 25 minutes per side at most) results in the need for a double LP, but not necessarily all four sides.  It all depends on the length of the original CD.

That sucks. An outer ring fixes all warps.

@baylinor 

That's not entirely true especially when a record is "washboard" in the center of the record surface.

@audphile1 

I had similar issues with the Cassandra Wilson.