Forced split screen when using dual monitors in Starcraft 2

I have a Nvidia graphics card and dual monitors. One is a 27" flat 16:9 and one is a 34" flat 21:9.

Using the dual-monitor third-party program displayfusion, I have Starcraft 2 set up on the 27", but recently I’ve been experiencing some strange technical issues.

I tried everything, even running a full system reformat, but the same thing happened. What is this problem?

This is an unusual symptom where the screen is partially outputting on the 27-inch, and similarly partially outputting on the 34-inch.

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