Have had two sets of spits in the last year and a half with bearing seat issues. RF 60mm and conical full 58mm. They replaced them (with classic shapes each time) no prob and those didn’t have an issue. Tried another set of CF 58 and the same thing happened. Switched to 55mm tablets and had no issue. Didn’t wanna deal with a third warranty claim in a year and a half so took the L on the 58s. With both the RF and CF I had to use a bearing press to get them in and then they’d pop out. The 55 tablets had no issue getting the bearings in and they’re locked in. Same with the classic shape. I wonder if there’s an issue with the wider contact wheels.
It would be even just one of the molds for those wheel shapes that is a touch out, or not calibrated correctly, that would cause the shape issue. I have seen other brands like Bones cutting out their own molds from aluminium or some metal like it and pouring urethane wheels, but not Spitfire, so don't know exactly how the mold sits, but there is usually a bottom cup like piece and then a top piece that fits in / locks in place for the duration of the process, which can then be taken off and the wheel popped out of the mold, before being cut down / shaped to what is desired, but that is only the outside area that is cut, not the inside.
There can be a lot of wheel molds all sitting together in rows / lines, so the possibility of getting just one wheel mold wrong from fifty to a hundred is still going to cause one wheel in every twelve to twenty five or so sets to be out, which might not sound like a whole lot, but that is still way too many wheels that can have issues in a few thousand sets of each shape / mold / run.
Stands to reason that some shapes have more issues than others, as dramas can unfold with new molds being created, whereas old molds might all be exactly correct for the tried and tested wheels, like Classics.
That's my take on it anyway.