I had this issue as well, but i believe it's unrelated to jamba.
basically, if all the toons are stacked and all call their drake, it seems some get confused and try the wrong mount or something.
Basically 5 drakes come down, but only 2/3/4 get mounted.
try and spread your toons a bit and you'll never have the problem again, they'll all jump on their own mount correctly :-)
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