iPhone 15 Promax iOS 17.4.1 multi touches issue

Please help.My iPhone doesn't work if I multi touches screen. If I hold 1-2 point on the screen then I have 50% that the next touch on home bar location won't responds. Is it iOS issue or screen issue.i already turn on guided access and hide home bar. I'm fps game player so it's really bad if I can not do multi touches