[Defender Pro] Plugins not updating

Hi, since migrating my site to your hosting platform, I’m unable to update plugins. After activating your Defender plugin any changes I try to make just sit there and don’t update and the same happens on the Hummingbird Pro plugin. This fault happens to all my plugins. I use the WP Forms plugin and when I update a form and go to save the form informs me it is saving changes but it just sits there and doesn’t update. This also happens on the staging site https://newmarketcyclingtriathlon.staging.wpmudev.host/wp-admin/admin.php?page=wpforms-builder&view=settings&form_id=5291. I have a copy of the site locally on my laptop (copied before I migrated the site to you) and this fault doesn’t happen. Help most appreciated. Kind regards Ken Parsons