After further research, it appears that the border I'm seeing is actually a "shadow that is under a dock", to a dock that isn't actually there. The shadow can be toggled (made to appear and disappear) under the xfwm4-tweaks-settings -> compositor -> check/uncheck "show shadows under dock windows". This works for now, or the compositor can be disabled. However, there shouldn't be an imaginary shadow on the screen.
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