I personally dont believe in his resurrection, but hypothetically speaking, there are probably many reasons why his scars could have been reported to be there. The first is, those reports were false. He may have been resurrected, but him having scars was misreported (even modern day "professional journalists" misreport things). The few people who did witness his resurrection probably couldnt even write, so whomever wrote that probably wasnt there to see it himself.
Or, Jesus wanted them to see the scars, or God wanted the scars there, thought I'm not sure why, since we know he basically disappeared after that, so its not like they wanted to show the scars to the world, which Jesus could have done if he wanted to, assuming his resurrection didnt have a limited duration. Maybe the resurrection "magic" only lasted for a few days, then he died and went to Heaven. Its hard to theorize since there inst anything written about it in the bible.
Or, God just overlooked the scars when he threw down his divine powers. Maybe he figured bringing him back from the dead was all that mattered.
Or, maybe not all of gods powers are perfectly planned down to the most minor detail. Maybe there is some randomness at play.