Coloured text in signs were darker than usual

When I typed a word in a sign using the white dye (§f), the text would suddenly appear in light grey instead of white. This glitch/ bug also appeared in other colour dyes for texts, all of them in which would appear in a darker/tinted tone of their original dye. [For example: When I type a random text in a sign using the red dye (§4). The text would appear in a tinted/darker tone of red]