Hello There,
Thanks for posting in! Please make sure that you are up to date. If you have just updated WordPress core to 5.5.2, please update it to 5.5.3 immediately. It could also be caused by a plugin conflict, amongst other things. Please check out this troubleshooting article here and follow the instructions for the following sections (where appropriate):
- Testing for Plugin Conflict
- Theme Update
- Child Theme
- CSS/JS Customization
- Increasing PHP Memory Limit
- Disabling Cache
- Disabling CDN
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