Cursor is deleting thousands lines of CSS itself

Bug Reports
1

:lady_beetle: Bug Report: CSS Duplication and Removal Issue

Description

For a very simple CSS change, Cursor generated massive duplication and unexpectedly removed a large portion of existing CSS. Specifically:

  • It increased our CSS file from ~4000 lines to ~9000 lines, mostly by duplicating existing styles.
  • Then, it removed 2000+ lines of CSS

Steps to Reproduce

  1. Open a project with a large CSS file (~4000 lines).
  2. Use Cursor to edit a small section’s UI styling.
  3. Observe the CSS file after saving or applying changes.

image
image946×1066 34.5 KB

System Info

Version: 0.48.9 (user setup)
VSCode Version: 1.96.2
Commit: 61e99179e4080fecf9d8b92c6e2e3e00fbfb53f0
Date: 2025-04-12T18:45:22.042Z
Electron: 34.3.4
Chromium: 132.0.6834.210
Node.js: 20.18.3
V8: 13.2.152.41-electron.0
OS: Windows_NT x64 10.0.19045

Blocking?

Yes, this issue significantly affects development by corrupting our existing styles and bloating our CSS files unnecessarily.

2

This topic was automatically closed 30 days after the last reply. New replies are no longer allowed.