We will be rolling out several small fixes mid-day today (Jan 29.) We do not anticipate any disruptions or problems, but f you spot any unexpected issues after 12 noon (PST), please report them in the designated thread in the DG Site Updates forum.
No, not common but it does happen sometimes that the centers are elongated rather than spherical. It would be interesting to know what causes the odd mutation. But I suppose it's like any other mutation - it just happens. :)