Not unusual. These are simple plastic push pins, that if not installed properly can fall out.
Imagine Service center will replace them, or just give you a handfull for a DIY fix. These push pins are a common item on most all modern cars. They have a center piece that you push in with your finger and it locks into place.
If you are not near a service center, your local Dodge dealer will also, most likely, be able to get you some inexpensively. Perhaps also at Pep Boys etc.
The usually are not critical, but hold plastic trim pieces in place.