I planted garlic and got onions... What?!

I know that garlic is supposed to be planted in the fall.  I know that.  Unfortunately, I did not get any in the ground last fall.  I have had some luck planting it in the spring. The result is typically much smaller cloves, but they are tasty just the same.  I hoped for the same result this year.  I decided that I could accept smaller cloves if I could store some homegrown garlic for use as the weather gets colder.  When the leaves began to fall over and die on my garlic, I took my cue to dig up the precious little bulbs to investigate my bounty.  They nearly all looked uniform in size and beautifully round.  I was excited.  I cleaned them up, dried them out a bit and brought them in the house to use and store in my cool cellar.  I began peeling one to use when I discovered a couple of fairly major differences about my cloves.