That's a pity.
I think there's more than one thing going on. Monobulbs should basically be about cold treatment, but the many shoots certainly shouldn't be related to that. Also your garlic seems, at least some of them, quite thick, which usually means those are not monobulbs.
You should definitely try a few more varieties next year. Also watch the fertilization. Onion and garlic (especially onion) both can start abnormal growth if suddenly overfertilized.
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