http://xmuppetsb.webs.com/ZC%20Content/Test%20Quests/blocktest.qst
In this test quest, I have a walking enemy that splits into 3 or more enemies on hit. Any enemies spawned after the first two do not move at all. Additionally, if it splits into another enemy that splits, any enemies after the first two would also be split into whatever they're supposed to split into.
Recurring bug with enemies that split!
Fixed in the next version.
The bug with offspring enemies being immobile is fixed, but the one involving the first offspring splitting if it splits on hit is not. Check this thread for details.