What happened to my strawberries? :(

Incomplete pollination can cause stunted fruits like in image posted. If Google image seach poor pollination strawberries you'll probably see some strawberries similar to yours ...

P.S. Have you been letting the pots they are in get dry?

 

Lottie this may help you understand it more

Strawberry Pollination – Strawberry Plants . org

 

I think they're only small fruit anyway as hanging variety ones? I've watered daily but I wonder if they have still got a bit dry maybe? We have lots of bees and insects so shouldn't be a pollination issue?