Thank you Parlapipas, it really is appreciated!

Did you try the usual switch theme - switch back- reboot bit to clear the cache? If not uninstall completely, navigate to opt/usr/share/themes using filebox then delete any m4rina-D4rK or M4riNa-D4rK related folders left there, then reinstall.

Believe me the last two were worse, I really am sorry everyone I'll get there

Kind Regards,
D4rKlar