Anyone have any ideas what may be wrong with this Allium Globemaster. It should be *much* taller, and the leaves are browned real bad. Thanks.

You do not give your zone.
In a cold zone I would suspect a touch of frost?
In a warm zone I would suspect lack of water.

I agree w/ Caroline, frost nipped some of my alliums this year w/ comparable damage; they did bloom ok though.

Sorry I don't know about Globemaster, I only have 'Purple Sensation' but the leaves on mine look pretty ugly like @jmorth's. Sometimes one or two out of the dozen of my bulbs just never get all the way to blooming. I count it as a 'dud'.
Here they are today in zone 7b:

Thank you all for posting!