Marking on seat after car detail

Do you know what could have caused this pattern on my synthetic leather seats? Had my car detailed yesterday, the guy had my car for about one hour, and I noticed this after I brought the car home last night. Photos are from this morning. My back seat was cluttered with kids stuff before hand and I didn't notice it, I'm wondering if my stuff somehow caused this or if you think it was something the detailer did? Chatgpt doesn't know. Thanks!