I have no idea why this is happening all of a sudden. I used to be able to edit these just fine without any problems.
The following pictures will illustrate my issue better than I can explain it.
Here's me creating a DGLux page as I always have:
Here is the resulting page. Please note that what used to be centered is now offset:
Now if I move the image far to the right, to a place where I cannot see and edit:
Now the view looks fine:
No version of container fit seems to fix anything: