Java Swing Table Alignment Fix

The values inside my JTable have suddenly started appearing out of alignment and it is throwing off the entire layout of the screen. I have already confirmed that the model is feeding the correct data, so the problem sits somewhere in the rendering or column-configuration layer. All I need is a sharp set of eyes to jump into the existing Java Swing codebase, spot the cause, and give me a concise patch (or clear instructions) that restores the expected alignment for every row, every time the table is refreshed.

You will receive:
• the relevant JFrame subclass, including the current TableModel and custom (or default) TableCellRenderer code
• a short sample dataset that reproduces the problem instantly

Deliverable:
• a corrected .java file (or diff/patch) plus a brief note explaining the fix so I can maintain it going forward

Acceptance criteria:
• all columns and rows render with consistent left / right / center alignment exactly as configured
• no visual regressions elsewhere in the UI
• solution compiles under Java 8 and above without introducing new libraries

A fast turnaround is ideal—I’m ready to test your fix as soon as you send it.