You may want to convert your Animation files to match your sequence settings - likely Apple ProRes 422 or Apple ProRes 422 (HQ) - and see if this resolves the issue. You may also have non-standard frame size or frame rate related issues with your Animation files that could also cause issues.
I would recommend contacting AJA technical support for assistance.
AJA Video Systems
+1 (530) 274-2048 Intl.
(800) 251-4224 US