Hey @OxfamPP,
Please check for the following first:
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Ensure everything is up to date
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If you’re using a caching plugin, please clear all caches including browser cache then deactivate your caching plugins and other optimization plugins. Your host might also have a built-in caching system. Please contact them to clear all caches also and deactivate caching.
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If you’re using a CDN, please clear the CDN’s cache and disable optimization services.
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Test for a plugin conflict. You can do this by deactivating all third party plugins, and seeing if the problem remains. If it’s fixed, you’ll know a plugin caused the problem, and you can narrow down which one by reactivating them one at a time.
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Remove custom CSS, Javascript and templates.
If nothing helps, please give us access to your WordPress admin in a Secure Note. We also need permission to troubleshoot in your site and that includes removing customizations and deactivating plugins. If that could not be done, please copy your site to a staging server and give us access.
Thanks.