Schedule builder enrollment issue

I am a bit stressed, when I try to enroll in the class it says, "You are already enrolled in this class." And when my schedule builder gives me a notification "Note: You are also registered for 'BIO-210 126L' (29147) however this class is not enabled for display in this tool." The class is not showing up on my schedule builder and it only shows that I have 10 credits when I am supposed to have 14 if we include BIO 210.