The wrong colours showing

I am using a theme to brand our internal content with our own colour pallet. When I come to change the player background colour the oddest thing happens. The player should use the colour #1C2541 which is a dark blue but when I am applying the player settings (using import player) the colour value shows correctly but the colour itself is showing as a lime green! I have attached a screen recording, you can see that it is not just the blue that is wrong.

This is an issue being experience by most of my team, the other interesting thing about this is they are seeing different colours appearing.

I am running the December version of Storyline (see screen capture). My first port of call is to drop down a version.

I should say, I have been using these player settings for about 3 months with no problems at all, it has just started to happen to me today. Has anyone else experienced this problem before? Any suggestions?