I used to have a Border Collie who was rescued from an abusive home. The first 6 months I had her, she was a VERY strange dog.
Then, one day she woke up and became "normal."
Your dog is just a year old, and probably still in the "terrible twos" stage. Like others have pointed out, they are VERY intelligent. My dog even started to understand words when I spelled them out. Border Collies also need a job. They get bored easily.
Just be patient with your dog and give it lots of love.