Issue Theme: cant change colours

HI there,
Ive been trying to edit the Upfront theme 'Issue' but found some options wont change.
1) Top left icon. Ive changed the text and the border colour but cant get the icon background colour to change to #FF6600
2) I looked in the main them colours and chose to edit one to have the main colour #FF6600 but this also didnt seem to change the orange colour in the theme.

Can you advise on what I am doing wrong?