If it working well, just ignored it. It may just appear some hard coded issue.It just some devide bounding with some specifc device. As long there is an issue. If you want just reset your router. I got this since last two firmware update for my AX11000.
Can you perfotm a factory hard reset to and reconfiured. Please refer to Asus website for your router model for instruction on how to perform factory reset of your router.