Auto correct is offering Spanish options while on English keyboard and vise versa

I have 2 keyboards set on my iPhone 8 iOS 11.2.1 along with the emoji keyboard. When typing in English on the English keyboard, I often get Spanish options for autocorrect/auto-fill. I’m not accidentally switching keyboards like other posts suggest, and I do not forcibly type Spanish words while using my English keyboard out of laziness to avoid touching the globe to properly switch the languages. If I did forcibly type in the wrong language, I fear that the phone’s internal English library would try to update itself with Spanish words as though they were custom/learned English words, but it seems that it has done that FOR BOTH LANGUAGE KEYBOARDS anyway. Please help! It is very frustrating and when I don’t catch it, it makes me look like an idiot when sending messages in a professional setting.