KP1805

I am new to using my Cowboy 4500 machine. We have sewn several items, but now the needle keeps hitting the bobbin. The bobbin case appears to be upside down (not in the right position) from when we began sewing with this machine. When the needle is in the highest position, the bobbin case is upside down. I have made sure the needle is installed all the way in. What are some other things I can try so we can get back to sewing? Thank you in advance for any ideas.