I have water coming out of the pvc pipe that comes out of the house there is a elbow with a over flow it looks like water is starting to come out of it now why

If it truly is the ejection from the sump pump, it means there is water accumulating and the pump is working. Best answer I can give with the info provided

A picture would help us. It could be the other PVC is partially blocked so the "overflow" pipe is take the discharge