Keyboard randomly moving to left

Hello guys, after more than a year of using new purchased iPhone 13 Pro I am writing you regarding very annoying keyboard glitch, when keyboard itself very randomly, time to time, mostly not even once per week, moving to left "one hand" mode, mostly in Signal or Whatsap app durning writing for sure. I dont use other native apps for writing to much, than I am no able say if this happening also in Messages or anywhere else. It usually moves when I want to click somewhere around "s" "d" keys, for example if I want to write word "Snapdragon", it moves when "S" is imputed, very occasionally, but even after many updates this still happening. I am holding my phone correctly, no other random/mistake imputs are possible. I am used to have a Spigen glass on displej and also some Spigen cases. Now I removed a glass and glitch still happening, it probably happened also with naked phone, mainly there is no gesture to make this in the system, it doesnt make a sense. You need to firstly click on "emotikon" on the left bottom position and here you can choose this one hand mode, few steps are necessary to activate this function. I feel like this phone doing a joke to me, everything perfect, just time to time he show me his mind. :-D Any suggestions why this happening? What shloud I do? Thanks.