Differences in katas?

Hi everyone. I started Goju Ryu in January of this year and one thing has kind of bugged me... I decided to take the super studious way of learning karate between classes and joined Goju Ryu Academy online and I also got loads of videos of Morio Higaonna Sensei doing our katas. I was certain this would ensure I'd learn things exactly how they had to be and eventually be super awesome in class.



The thing is... these videos often vary in timing during katas from what we do in the dojo. The kiai is sometimes not even on the same place and the bunkais also vary slightly. Is that normal? I've ended up ditching the videos for the most part because they just leave me confused in class.



I know I shouldn't over-think things... I'm getting better at that, but it does bother me that there doesn't seem to one correct way to go about it.