publications - one of my revised article rejected by journal for some issue in the journal now submitted in the second and the status are given below?

I submitted an article to JMES (Journal of materials science material in electronic) on April 3. On April 10 the status was changed to "Under Review" and on May 7 to "Review Completed", but then on May 22 the status was changed back to "Under Review". what happened i dont know can anyone explain please?