Full photospheres getting cropped randomally at some point

[GbeTech]

Hey everyone,

Sometimes I take a completely full sphere, but after rendering it, it doesn't display it fully.

For example:
Http://imageshack.com/a/img809/1520/xwob.png

Here's the picture's info.
Specifically the line "CroppedAreaLeftPixels" is above 0 (214). With full spheres, it's 0.

http://imageshack.com/a/img46/7136/d7p2.png

The thing is, the number of pictures in that sphere is 33, exactly as with a full sphere. Meaning it's not that I took to little pictures, it's just the rendering algorithm.

Any way to fix that, after the sphere has been taken?
Or maybe prevent it in the future?

Thanks.