My iPhone 15 switching keyboards and draining battery quickly

My iPhone 15 keeps switching keyboards and I don't know why I for instance have my SwiftKey working which is odd it's changes after 3 seconds usually also my iPhone 15 battery drains so **** quick I need some answers anymore thanks

[Re-Titled by Moderator]

Original Title: Answer on why iPhone 15 keyboard is switching from the one I have and my battery is also draining quick