The issue is that jQuery runs its selectors sequentially, rather than compiling them into one selector. So :gt(3):lt(2) means "find all the elements in the set with an index of more than 3, then, in the returned set, find all elements with an index less than 2". Turning it round td:lt(2):gt(3) changes the order of the logic, so gives a different result.
The indexes are re-indexed after a first filtering, this is sequential.
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