Are you the person showing the PowerPoint presentation? If so, yes, your PowerPoint transitions will look fine on your computer... but the recorded presentation is based on the transmitted presentation, and the frame rate of transmission will cause your beautiful transitions to look choppy everywhere else except on your screen. Most likely your attendees are also seeing choppy transitions... and in most cases they won't notice, because they don't know what your presentation is supposed to look like, and they assume you intended them to look that way.
Or if they're very experienced Zoom presenters, they might be thinking to themselves, "If you're going to have transitions in your PowerPoint, you need to turn on Optimize for video before sharing."
So your comment is correct... "the recording issue is somewhere within the zoom settings"... it's in not checking the Optimize for video when you start the screen sharing. Check that box, and the recording should be good!