I have noticed a slight problem with my Whites Tree Frog Tadpoles.

There seems to be a bend in the tails of 2 of them. I have taken some pics to show what I mean.

They seem to be healthy, growing large and unaffected by this abnormality, and it is only in 2 of them so far.

Their tiny legs are beginning to grow, and from what I can tell it hasn’t effected their brand new limbs.

Is this normal? Is it bad? What can I do?