This question originally said "The question is to find all the possible limits of (1/n,0)." This was edited to "It is to find all the possible limits of (1/n,0)." While the edit also included other changes that improved the question, this portion of the edit introduced the pronoun "It" with no antecedent. When I suggested an edit restoring "The question" in place of "It", it was rejected. I also tried to change "I begin to find the open set" to "I begin by finding the open sets". I don't understand why people are insisting on having the question be in broken English.
Your edit was perfectly fine, and the initial edit should not have been accepted (at least without additionally correcting the errors it introduced). Editors and reviewers are human and sometimes make mistakes (or don't speak English perfectly). That's all there is to it.