No, it's not normal. There are a few things that are fairly common causes of this to happen though. First, you said that you have two lizards, do they fight? If so, it is probably a result of a fight. Also, are the temperatures correct? Is the humidity? If they are not, this is another thing that could be causing both the toe and the tail problem. Another possible answer to the toe getting lost would be that something had wrapped around it and cut off circulation. Also, did you notice the toe having any discoloration, or drying before it fell off, or did it fall off suddenly? If it fell of suddenly, I really don't know what it could have been besides a fight. I recommend taking them both to a Heep. Vet asap.
Losing a toe is not normal. Trauma from fighting or injury from the cage is possible. With exotics husbandry is often a cause of problems. Environment-type of cage, temperature, etc and nutrition can also cause deformities in reptiles. This lizard needs to be examined by a veterinarian for an examination and review of housing/nutrition. They will help you with the lizard and help prevent this from happening in the future.