i recently restrung my Aero storm with Babolat revenge strings for the first time. after a few hours of play i saw that the 3 outer strings on each side moved kinda far. so i moved them back and i heard a scraping like sound. then a week like some of the mains have scratched the crosses. It seemed as the mains scraped the crosses. you can notice it because part of the string turned red-ish white. Is this natural for this particular string? is this what stiff strings do?