What could be causing glitches in both the Webflow Designer and live site for a specific site, only when accessing the CMS section?

CMS-related glitches in both the Webflow Designer and the live site often point to issues with CMS content, custom code, or third-party scripts that interact with the CMS.

1. Check for Corrupt or Overloaded CMS Content

• Large CMS collections with thousands of items or complex rich text fields can cause performance problems.
• Content with broken links, heavy images, or malformed text (e.g., unclosed HTML tags in rich text) can disrupt rendering.
• Temporarily reduce or simplify CMS entries or try duplicating the collection structure with fewer test items to see if the issue resolves.

2. Review Custom Code and CMS Bindings

• Any custom JS or CSS using cms-item, cms-list, or dynamic elements can malfunction if collections are renamed or IDs change.
• Check for script errors in custom code blocks that rely on CMS data bindings or slug paths.
• If using scripts in Embed elements bound to CMS fields (like inside a Collection List), temporarily remove those to isolate the error.

3. Inspect Third-Party Integrations

• Plugins like Jetboost, Memberstack, Finsweet attributes, or custom filtering/sorting scripts may conflict with recent CMS updates or collection changes.
• Verify that any third-party widget or script is still compatible with your current page structure and CMS fields.

4. Monitor Site and Designer Console for Errors

• Open Developer Tools (F12 in most browsers), then go to the Console tab while on a CMS template page or collection list section.
• Look for JavaScript errors, 404 requests, or TypeError messages that may indicate what’s breaking the page in both Designer and live mode.

5. Test in Safe Environment

• Duplicate the project and remove CMS custom scripts one by one.
• Try deleting and re-adding the affected collection (after backing up) if the CMS item references aren't functioning correctly.

Summary

Glitches in Webflow's CMS typically stem from corrupt CMS entries, broken custom code, or incompatible third-party plugins tied to CMS collections. Isolate the issue using the browser console, simplify your data where possible, and test without custom scripts to pinpoint the cause.