It's not weird that you didn't get the maxi dresses and date night clothes in your online store after purchasing them - it is weird that you got the baby pack again.
You really shouldn't get offered packs in your online store if you've already purchased them.
The only weird packs so far are the Alternative outfits - you will get that offer even if you got the outfits for free during the limited time offer during Coachella last year, and when the Complete Baby Bundle returned but split into different packs - each of those packs were considered "new" so we were all offered them even if we had the items they contained.
Then there's the "Already In-Game Items" bundles - some of those are just always going to repeat even if you purchase them (Green Honeycomb, Second Story Sunlight, Scandinavian Countertops...).
But really, if you've purchased the Baby Furniture pack before you shouldn't be offered it again. Maybe there's something going on with the online store on FM's end.