iPhone Keyboard Keeps Switching from proper English to US

Hey guys,

I have a strange little issue with my iPhone 5, running the latest iOS:

I toggle between Spanish, German and English using the globe-button on the software keyboard in WhatsApp, Messages and the Gmail App. I chose English, but every once it a while it switches to American.

Is there any way to stop this u-vanishing, s-to-z-sodomising madness?

Thanks!