Hello! This is my fifth Blender project, and I have met this issue frequently. I am wondering why there are overlapped faces cconnecting to random vertices here… I did not connect them myself. I am wondering if it could be a misuse of any modifiers, and I am wondering if there is a way to fix it. I have tried to delete those edges with Edge mode, but that does not help, as Blender does not recognize those as edges. Thanks in advance!