Issue with VO Player Visibility in Articulate Rise Theme Customization

In the articulate rise, we modified the theme to match the branding. We added a custom dark gray color to the theme and set the contrast to "Auto." However, when we add audio to the quiz question, the VO player becomes invisible. When we change the contrast to "Dark" in the theme, the VO player becomes visible. Could you assist with this issue?

Auto: 

https://360.articulate.com/review/content/af25f2cd-a7f8-48e1-bf8e-6615fd812f4f/review
Dark: 

https://360.articulate.com/review/content/750037e7-1118-4e88-ab3d-18b2474a7c4b/review

We have attached screenshots of the "Auto" and "Dark" contrast settings for your reference. Additionally, we have noticed that this contrast issue does not occur in the knowledge check question. A screenshot of the knowledge check settings has also been attached for your reference.