Closed caption button on player disappears when captions clicked on

When I click the button to turn on closed captions, it disappears from the player. Although invisible, it let's me click again to hide the captions and doing so makes the button visible again.

This course is being published for LMS, with the HTML5 only. 

What am I doing wrong? Thanks!

Captions off, button visible

Captions on, button invisible

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