Hi @Soyunrio , it’s always great to see local guides getting interested in map editing. But that can indeed be quite challenging at times (also due to some elements that are a bit counterintuitive).
In this particular case, the concept of ‘layers’ plays an important role. Everything local guides can work on is situated on the POI (points of interest) layer. Train stations (and bus stops, etc) are on another layer, the transit layer - not open for edits from local guides. The counterintuitive thing here is that we do see a ‘Suggest an edit’ button on train stations, but I think that is simply part of the template applied by the Google team to allow us to add pictures and reviews. But edits of train stations will be rejected for all local guides (so: no, it has nothing to do with your account in particular).
If you want to learn more about layers, check out this podcast episode: Episode 41: Layers – LetsGuide Podcast
And since you are motivated to make more edits, do check out some of the other podcast episodes - you might find them interesting.