Thanks for the bug report.
I believe I have found and fixed the issue.
If possible, can you please download and test the latest build of ACF PRO?
1. Login to your account online: http://www.advancedcustomfields.com/my-account
2. Click on the ‘see all versions’ link next to your license
3. Download the latest 5.4.4-RC1 version
Please let me know if this solves the problem and I will release a patch.
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