Normal audio is "eu tenho animal, é um rato". Um misses in the first part of the sentence. Not sure if that is done on purpose so that the person doing the test will notice and add the article there anyway?
Slow version very clearly contains the um, the fast version doesn't.
Yes, the "um" is deffinitely missing in that sentence when you play normal-paced audio, but it is present in the slower recording. I come across this occasionally even in other courses. It makes me wonder, whether the course creators have no time to check the content of the course before they have it go public.