I assume you are using pandasoft to export? I know I always had issues exporting animations using that and had to set some pretty specific settings in order to export it properly. It's been a terribly long time since I've done it, so I wouldn't know where to begin with the settings without some trial and error. I found this:
in another thread. You may take a look at it and see if there are any settings that you have different. Best of luck!
My green thumb grew the tree my Trojan War horse was crafted from. With roses in our pockets we rally round the tombstones. Ashes to ashes, we all fall down.