[Resolved] Advanced Custom Fields global options page overwriting content on save

I am trying to:
I've had this issue on numerous sites that use ACF global options page and am now keen to get to the bottom of it. The issue occurs when you have a global options page (call it "button text" for this example), and decide to edit this global options page in two languages at the same time. So you have one tab open with the EN version showing, and another tab with the DE version showing.

Which ever tab you save last, overwrites both translations of the global options page. Or it could be that whatever tab you opened last overwrites both translations.

Is this down to the browser cookie solely deciding where the content is saved?

URL of (my) website where problem appears:

I expected to see:

Instead, I got:

Steps to duplicate the issue: Very simply to replicate, just install ACF on a site with multiple languages and create a global options page with various text fields. Now open this options page in the variety of languages available at the same time and start editing and hitting save. Refresh the other tabs and you'll notice content gets overwritten.

The only way i've managed to get around this is by editing the global options page in one language at one time. However, such careful consideration can't be maintained for other users.