saw someone else’s first radish harvest, here’s mine

The other half didn’t bulb at all 😭

Any tips on what could have gone wrong?
Planted in raised bed with loosened and compost amended soil, spaced 2 inches apart. Planted first succession 2/20 (zone 8a) and they germinated, but were VERRY slow to grow true leaves. Second succession planted in the space next to the first on 3/20, and same deal. I thought radishes grew super quick?? Super easy??? 😭😭😭