First of all, can i know how did you open your view finder?
The correct way is push it in and it will auto pop-up. If you did it incorrectly (eg, directly pull the view finder) you might damage the components inside. If that's really happened, unfortunately you have to bring your Sprocket to the customer service and let the staff fix it for you.
If you always follow the correct way. Probably you didn't push the view finder to the correct position. You need to push it inside and a little bit lower than the flat position. You can feel and hear that there is a "click". Then the view finder is closed and locked.