I'm glad that part is over for you.
I would think maybe they say odd things when they don't really know what to say or do. Likely, all will get on with their lives.
For about a month after my mom passed I received emails and cards. It was weird as I had not heard from these people in years. But it was thoughtful for them to take the time to communicate. I never responded, so I'm prob the a$$. But what do you do...
You were lucky to have such a loving relationship with your mom. Sending comfort and peace your way min.