My guess and this is just a guess, but with 3 differing monitors the driver is maybe looking for a refresh rate that is common amongst them and the resolution you stated is maybe where that sweet spot is.
All screens have to be synced together and if the refresh rates aren't exactly the same or close enough, the driver probably looks for a resolution/refresh rate supported by each monitor that is the closest between 3 differing monitors.
Hard to say what's going on or if there is a fix for it.
Have you tried different drivers? Have you tried connecting them differently? Have you looked at each monitors resolutions/refresh rates and compared them?
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