Not sure if I should report this as a bug or help. But I think it is a normal thing in KDE. I have a 2in1 laptop which can be converted to a tablet (lid goes all the way around). Whenever I am using touch the virtual keyboard shows up even when I didn’t select an input field. For example, moving into a new tab the keyboard just opens up covering up the screen.
For now I have just switched off the virtual keyboard and inserted an icon the panel which can be enabled and disabled, whenever I need it. Would like to know if any issue has been created regarding this? Is the issue being worked on?