Oh, for fuck's sake. How many times have you been told? Bugs are by nature slippery and can often be very hard to reproduce. That's why bug fixes can take so long, because you might fail to see them under identical conditions. DLSS isn't a bug. It's consistent. If there is ghosting caused by DLSS, it'll still be there after shutting down your PC or reloading the game. It won't appear one time and be gone the next. That goes for other issues.
Your conclusion is incorrect because if it was correct, we'd have no issue reproducing your problem as you assert that it was DLSS, not a bug.
Could it be that you changed your resolution and it went away? Maybe you flicked between multiple upscalers and it triggered something that fixed it? Whatever the case, we know it can't be DLSS, because none of us can replicate it. Therefore, bug is the only logical conclusion, because it covers every other possible scenario.