I also can't tell what is going on in your photo, and I don't have a Calibro here to look at, but here goes:
First, is the mask still sealing and keeping out water? If not, then no further discussion is required.
Now, here is the description of the Calibro "Integrated Dual Frame" from my Cressi catalog. This might explain it for you, or perhaps it indicates something just needs to be snapped back into place. (I can't quite visualize what is being described here without seeing the mask close up.)
IDF: "The Patented Dual frame Technology consists of the joining of two rigid frames, the first on the rear of the silicone skirt and the second, anterior to the first one, that support the lenses. When the two frames are joined and locked together, the silicone skirt remains locked in the middle to guarantee a perfect seal between the face piece and the lens."
You might be seeing a normal (for this mask) gap between the two frames, that allows for the better fit.