Nope - sounds like they're doing fine. The small bulb (set) that you planted in March contained food to feed the leaves and roots in the initial stages. As it was used up the swollen leaf bases (forming the bulb) shrank, leaving what was the bulb feeling soft. The leaves photosynthesise, making food, which makes more leaves and roots. It looks like they've got plenty of leaves now.
This goes on till the days start getting shorter, and the more leaves they have by then the better. Because after midsummer (less than three weeks now ) they stop making new leaves and start sending the food they're making down into the leaf bases - which makes a new bulb start swelling with food stored for next spring's growth. Except that we come along and pull them up in the autumn and eat them ourselves .
So, the long and the short of it is that they shouldn't be swelling now, but they should start doing so next month. Fret not. All is well!
They'd prefer full sun, but they'll put up with what they get (they just won't get quite so big), and I'm sure you know you need to get plenty of organic matter into your rich clay soil to break it up a bit and release all those nutrients.