True hairless is recessive and you might have two 'het' hairless in your rats that are producing some hairless babies. That way you would have no rex, but get hairless. Rex x rex hairless are often patchy instead of all hairless too.
My hairless line was happenchance too. I got a small colony that had never produced a hairless, but I had to pair them up randomly because the original bins were all put together for transport when I picked them up. So I randomly set up bins of 1.3 and ended up with the 'het' hairless in the same bin by chance when they'd never been put together before and BLAMO hairless babies. Only one or two at a time but now I have a lot of really nice hairless rats.
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