[Mazzlefizz]

Originally Posted by Cilas I've heard (but cannot confirm) that this is due to the order the druid recieved their forms. The number is assigned to the druid in the order he or she actually recieved them. Typically a druid gains their forms Bear/Water/Cat/Travel/Spec Form. However, because some skip or delay the water form, it can mess up the numbering order for scripting. The above could be all lies. I'm just repeating what I read somewhere on the tubes. And they do get clogged sometimes.

Looking at one the Blizzard API functions, there's a function that returns the information about a form based on the order on your shapeshift bar. I don't know if it's true, but it's possible that the numbering is dependent not only on which forms you know but also the order you learned them.