Thankfully, I've found the solution to the conflict I was facing. I simply wasn't thinking to switch the value of the nonlinear key format. I believe I should be all good from this point on :) Than...
I'm sorry; I may not have been clear about the error at hand. The creation of the keys isn't the problem, in fact I took those screenshots from keys that I created in the score. It's just that for ...
The key signatures used only use standard accidentals and carry a standard diatonic scale pattern, and they occur after each-other. I am using Finale v. 26 on Mac. Should it be useful, I have also ...