Panda Tutorial Issue

I am having a problem in the Panda Park tutorial, and am desperate for help. I successfully moved one male panda into his new habitat, and have made the habitat perfect, over 90% for everything. The three female pandas are ready to come out of quarantine. I have not edited the barrier in any way, and in fact I don't think it can be edited. Yet, when I try to move the female pandas out of quarantine and into the new habitat, it says "invalid destination". Can't put them anywhere. Have I hit a bug??? There must be a way to do this, but it's getting very frustrating. Hope the forums can help me!
 
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