u-joint question

I was inspecting my u-joints and noticed my front yoke only had two c-clips on it. The u-joint caps on the driveshaft portion have the clips but the caps that hold the shaft to the yoke do not. I know they are pressed in but shouldn't they have clips also? It looks like the caps are not in all the way since they are almost flush with the outside edge of the yoke. I've driven it pretty hard too, A trip to the track once and just gettin on it at times. I've got a 10k on the drive shaft and it's still there.......now that I saw this I'm just worried it may be a accident waiting to happen.