Category background colors do not show in the calendar

Hi there, this issue has been evident to me since version 5.4. I have set background colors in my installation but they do not show up at all in the Monthly Calendar (which I use as default) nor in the Weekly or Daily version clickable from the Monthly calendar.
 
remotescrumstudy.com/calendar  

I have added a lot of CSS instructions to get the course titles and scheduled-hour spacing to look right in the Monthly calendar. But I did not set a default color for the courses; the Category background color should take precedence. Can you tell me where to look to find what might be blocking those Category colors from coming through? 
 

Hi Toolie

For this, we will have to check it directly on your site. Could you please submit a support ticket sending me super user account of your site, link to this calendar page and tell me the category which you configure color but not works in the calendar

I will check to see why it is not working and get it sorted

Regards,

Tuan

Ticket created. Thank you Tuan!

Thanks Toolie. Received ticket but the super user account is incorrect. Please check and reply me via support ticket and we will continue from there

Regards,

Tuan