Future MIL

My fiancé gifted me a Kendra Scott necklace for my birthday and a few weeks later his mom is wearing the exact same one. When he proposed he got me a halo princess cut engagement ring and fast forward to a few days later his mom is wearing the exact same ring except hers has more carats.

Am I crazy to think that is super strange?

I am running to Kendra Scott to exchange the necklace for another color. They have so many stones to choose from why would she get the exact same one? Should I even ask who is getting her the same things? Is this all in my head? I need advice 😕