Answer: Smaller corms will produce smaller plants and smaller flowers, so this could explain the small size. The cormels left over after removing the larger ones, or in the case of untouched corms, corms that have multiplied over the summer, will produce smaller plants due to crowding as well as smaller size overall.
Glad blooms would normally fade after a little while, and cold weather could ruin them as well.
There is one other possibility and that is that you have some of the small sized "hardy" glads that grow and bloom much as a spring flowering bulb would. These are left in place from year to year rather than dug.
At this point, remove the faded blooms and allow the foliage to grow all season so it can replenish the plant's strength.
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