Shift + Quote + A key issue
I'm a developer and I often use left shift + " + A (letter key). The result is Ä instead of "A".
It drives me crazy. I have my smart quotes key off and I still get that. It makes me go back over and over to fix typing issues. I googled it but basically read the same thing - ie turn off smart quotes (which I've already done).
Here's a screenshot of my settings:
MacBook