Popping/clicking sound on Iphone 13 promax

hi,

I have just purchased 13 promax but noticed a sound by pressing back corner beside apple logo while keeping mobile in hand and pressing both back and front screen making C shape fingers . i haven't noticed this earlier in same model and even while using 12 pro max ,may be wasn't in my intentions earlier so wasn't noticed this on previous handsets !!!!and this time accidentally while cleaning my front glass so made a slight push which also make me to get notice of this sound !! i am much worried now and keep searching different post of similar in nature in apple community or other platforms but couldn't get any satisfactory response !!! can someone advise me please that is it something normal or shall i return my device as it is some hardware or manufacturing fault ??