What could be causing glitches in the Designer and live site of a specific Webflow project, specifically when using the CMS section, while other projects in the same account are not affected?

Glitches in the Webflow Designer and live site specifically within the CMS section of one project can stem from corrupted CMS data, custom code conflicts, or broken bindings. Here’s how to identify and fix the issue:

1. Check for Corrupted CMS Items

• Duplicate or invalid data structures (e.g., extensive Rich Text fields with broken embedded elements) can cause Designer lag or rendering bugs.
• Content with unusual characters, excessive inline styles, or malformed embeds may break CMS display.
• Solution: Go to CMS Collections, examine recent item edits/updates, and delete or clean up problematic records.

2. Review Custom Code Conflicts

• Custom code blocks in CMS templates can break layout or functionality on both Designer and published site.
• Some code only runs or breaks when CMS bindings are present, masking the issue in static pages.
• Solution: Check the Page Settings > Custom Code of template pages and the CMS Collection Page itself. Temporarily disable scripts to isolate issues.

3. Audit Collection List Bindings

• If elements are bound to fields that were deleted or renamed, the Designer may behave unpredictably.
• Also, nested Collection Lists trying to reference multi-reference fields incorrectly can break layout.
• Solution: Ensure all bindings reference valid fields. Re-map or re-structure problem sections.

4. Compare vs. Working Projects

• Since other projects work normally, isolate what’s unique in structure or code in the broken project.
• Check for third-party integrations only used in the problematic project (e.g., custom scripts, plugin embeds like Typeform, Hubspot, etc.).

5. Test in Incognito Mode or with Extensions Disabled

• Rarely, browser extensions (like ad-blockers) interfere with the Webflow Designer—especially on sites with embedded CMS-dependent JavaScript.
• Solution: Use Incognito Mode or try another browser to confirm if external interference exists.

6. Check for CMS Limits

• If your project is near or over Webflow CMS limits (e.g., 10,000 items, 100 fields per collection), performance issues can arise.
• Solution: Go to Project Settings > Hosting > CMS and verify collection count, fields per item, and total CMS entries.

7. Use Webflow’s Error Logs and Console

• Open the Developer Console in your browser to catch any JavaScript errors in the Designer or the live CMS pages.
• Errors like “Cannot read property X of undefined” can indicate broken bindings or code problems.

Summary

To fix Designer and live site glitches tied to CMS on one project, focus on cleaning corrupted CMS content, removing faulty custom code, and verifying bindings. Since other projects are unaffected, the issue is almost certainly internal to this specific project’s CMS setup or scripts.