Amanda, you need to keep the strawberries up off the ground to prevent worms and other creepy crawlies from getting to them. They're young earthworms I think.
Believe it or not, this is the reason they called them "straw" berries in the first place. Farmers put handfuls of straw under the berry stems so the berries would not touch the ground. Eventually it became the norm to mulch the plants all around with straw. Growing them in containers, or raised beds so that the berries can hang over the edges works well, too
Propping them up with sticks or rocks or pieces of wood will help, too. I used to be expert at it when we lived in the Pac. Northwest but I've given up trying to grow strawberries down here - too many other species compete for them, and I wasn't getting any berries at all. Squirrels, birds of all kinds, bugs, worms, raccoons, other people . . .
