“Interesting shoes”

“Just started running again and bought these to replace some old Aasics Gel Kayanos that I loved. Bought them one size bigger and the shoe fits perfectly from heal to toe. However, I feel my heel lift as I walk in them. Took them for a run and did not have the same experience; no annoying lift noticed. However, I can't say I love them due to my walking experience. Good cushion; comfortable out of the box. Think the problem may be b/c they tie too low in the foot?”