It's pretty normal to have interviews on different days. Each case is unique. Even if you filed together, it's still two separate petitions, potentially with different adjudicators.
You can safely ignore MyProgress tab. It's largely inaccurate in 99% of cases. It doesn't have any legal binding, doesn't provide any real estimate.
I'd just wait for the interview to be schedules. Let your husband go through it, and hopefully you'll get update soon too. You filed in July 2024? You're still well within normal processing times. If a 1.5 years goes by, then I'd start worrying.