The smaller bulbs are most likely from the neglect and stress but they have not matured enough to show their overall size. The plant is growing simmilar to Colmanaras which are hybrids in the oncidium/ondontoglossum alliances. It may have only one growth period each and sometimes the growths bloom before they mature or even if their very small as long as the previous growth is large enough to sustain the expenditure of energy by the new growth. The new growths in the picture are not begining to swell yet so they may still produce a larger bulb than what is expected but it will certainly be smaller than the previous growth. The already matured growth will no longer enlarge but it is just as healthy as the larger growth. Dont divide it for another year or two, the growing mix looks good and oncidium/odontoglossum hybrids resent being divided too soon as well as being repotted. I would wait until the plant begins to send roots over the pots edge before repotting unless you have very humid conditions. If you do want to repot wait until the last growth matures and do it before the next lead begins to show.
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