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I can verify. My solution does not produce the correct output for this proposed test case as well because 2/4 is not in its most simplified form, so it computes the lcm for 4, 5 and 7 when it really should be computing the lcm for 2, 5 and 7. Really good observation here--the question should be changed to also require the simplification of fractions, which would be a nice additional exercise.
I agree. Most of the top solutions have this bug, because the tests of this kata do not cover the case that a rational may not be initially simplified.
I opened a suggestion about this here: http://www.codewars.com/kata/54d7660d2daf68c619000d95/discuss