This Torch Down Modified roof membrane is delaminating and sliding. This is caused by improper fastening. On roofs with a slight pitch it’s required to fasten each row. Without lifting up every row and breaking the sealing asphalt seams, it’s impossible to tell if the problem is consistent throughout the entire roof or just the areas visible. Generally, if the same crew or person installed the roof, the problem is consistent. There’s a good possibility this roof will continue to experience this problem in the future, especially after high wind events.