Thanks for the extra information.
Since the Materia effects are working and the mastery stars/icons are displaying correctly, I'd like to rule out a database setup issue first.
The plugin pulls the displayed information directly from your RPG Maker database. For example:
• The description shown in the Materia scene comes from the Materia item's Description field in the Armor database.
• Skill names are pulled from the Skills database based on the IDs used in your "<skill: x>" or "<skills: x;y;z>" notetags.
• AP progression values are pulled from the referenced skills' note boxes using the "<ap: x>" notetag.
So if a Materia has no description, or if the referenced skills are missing names or AP notetags, the scene may have little or no text to display.
Could you check one of the Materia that isn't displaying correctly and verify that:
- The Materia has a description in the Armor database.
- The skill IDs in its notetags point to existing skills.
- Those skills have names set.
- Those skills have "<ap: x>" notetags if you're using AP progression.
Also, since you're using VisuStella plugins, please try moving the Materia plugin near the bottom of your plugin list (below all plugins) and see if that changes anything.
You can also add me on discord and send me a screenshot of the issue;
@paradajz93