Strange garlic

I have accidentally mixed up the leeks and garlic this year - forgot I planted garlic and popped some leek seeds in as well  . Anyway I was digging up the baby leeks to spread them out a bit, and accidentally sliced a garlic in half.  When I looked at it, it was an onion, or so I thought.  Anyway, chucked it in the trug and when I got it in the kitchen the whole house smelt of garlic, but it is just one great big clove, looks just like an onion!  It's about  4 cm across and very very smelly!,  is this normal?

Yes it may be elephant garlic, but the one I planted def had cloves!  Will mine all be like this then?

Elephant garlic does have cloves,  mine were quite big  -
but only every 2nd year according to this site
 
http://greenharvest.com.au/Plants/Information/ElephantGarlic.html

Yeah some garlic are slow to form cloves and stay as round like onions. They are still delicious and dry well. My garlic that I've just pulled out was planted in September last year and quite a few were roundies as well as cloves. They all grew exceptionally well.

So can I just leave them in for another year then, to get bigger and form cloves?

Ok, thanks Gavin. When will they be ready to lift next year?