Click save has no effect

Hello,

For some reason clicking the save button seems to have no effect. Today I've been trying to change settings on plugins (myCred and Woocommerce), but every time I click save the page reloads with the previous data.

I've tried switching to the 2016 theme and disabling all but the affected plugins, but it still seems to happen. I've even disabled caching. Widgets seem to save OK, just not plugin settings. I have granted support access. If you could help out that would be awesome!