Since 4.4 was released, the positioning for checkboxes when using Restrict Access > Must > Grade is incorrect.

Testing instructions:

• Take any activity.
• Add an access restriction
• Choose Grade
• Confirm that the checkbox does not overlap the word 'must'.

As a quick workaround, adding the following custom CSS fixes the issue:

span.availability-group input.form-check-input { position: static; }