Do you recall having one ( or two, on both sides ) AI exactly close to your parking spot ? From your screenshot, it looks like the panel thought there was an AI in your place, so it's not showing GSX indications, because those are reserved for your airplane only.
In any case, it's entirely normal that, on a parking that has a panel, GSX would "silence" most of its green text message: they would instead appear on the Panel, which greater realism and immersion.
Try in a place where there are no AI close, and see if it works. If it does, we can probably tweak the AI search range a bit, to prevent the problem.