t-shirt of my club have bug

[Cat Harrison]

The only reason for it to not allow a shirt to be used is if in doing so both home and away would have the same base/primary color.

@Kovalainen32m Both shirts are black base color, you cannot use them as Home and Away, and deleting the one that is not black isn't possible.

@Lechita If they were actually sold as a Season's set you should be able to use them as Home and Away.
If you bought them of different seasons, they may have same primary color, and not be possible to use together.