Thank you for posting in the community! Was "organization" a required field for your registrants? Are we 100% sure that this field was available to them during sign up for the webinar in question? If you can provide the Webinar ID I'd be glad to check some settings for this session.
I've done some investigation and it doesn't appear that "Organization" was an available field for people registering for the two sessions listed above. I've checked some of the upcoming GoToTraining sessions under the same organizer account and it appears that some of them have this field available to registrants and some do not. Please double check the registration settings to ensure that this field is enabled for any upcoming sessions where this info is required. Information on how to configure these settings can be seen here.