Beardie tail is soft

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My beardie is a year and a half old now, in the past month two claws have fallen off, the first one i assumed was an accident but once the second one fell off I was concerned and thought he needed more calcium or D3, now ive realized he isnt trying to get shed off of his tail, and his tail is very soft, this is very concerning to me. His lighting is a Powersun UV 160W. Hes still eating and is active, help would be appreciated thanks. This picture shows the discoloration from his tail to his body.
[Click image to enlarge]
