An Unusual Problem

This is my keyboard.

It's English/Korean convertible.  Or should I maybe say, QWERTY-to-KaNaDa convertible.  Roman alphabet characters at the upper left corner of each key, the Hangeul/한글 characters at the lower right corner.  You switch between languages by pressing the "alt" key.

I learned to type in middle school typing class all those years ago (do they still have those? it's been a long ride since then).  And once I mastered typing in English, I found myself automatically transliterating Korean words and sentences into English spelling and mentally typing them out in my head, using a personal system which I now know to be close to the Revised Romanization system for Korean-to-English transliteration, rather than the McCune-Reischauer system (although now I personally am of the opinion that the MR system is actually the superior of the two).  For example "사랑해요", or "I love you", would be spelled out as "sa-rang-hae-yo".  Mind you, I was doing this in my head constantly.  I came to be pretty good at this mental trick, but maybe a little too good -- now and then I would find myself mixing up the two languages and hitting the wrong keys here and there.  Which was a bit annoying but not really serious.  Fast forward a few decades, I move to Korea and have to learn to type Korean in earnest.  Actual Korean language sentences using the Hangeul alphabet, not Roman alphabet characters like I used to do;  it's entirely different from the Qwerty system and all the muscle memory I'd built up for English words is now confusing me!  And although I'm still not all that proficient at typing in Korean, I now find myself mixing up three entirely different ways to type two entirely different languages.  If I were to spell out "I love you" the English way using the Korean keyboard, it would come out like this: ㅑㅣㅐㅍㄷ ㅛㅐㅕ, which is gobbledygook in both languages.  Does anything like this happen to other people who are bi- or multilingual?  I'm curious to know.