Could be he developed wrong in embryo stage. Or mom had an accident. There are countless things that can explain his tail kink. If your worried gas off mom and dad but I don't believe it to be genetic. Looks like his tail got stuck.
EDIT: He looks like a Merle but his pattern is light. http://www.dreameyce.com/eagleseye/r.../merlerats.htm What colors are the parents?
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