Unknown faces on Models

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!

Hello this issue is when vertices are overlapping their connections to other vertices
you need to connect you vertices right

Like this

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Sorry for the late reply…
Will try soon. Thank you for your help!