Shifted RGB values

Hello!! When I use "tints" in an item model, it seems like the RGB values i enter for the "default" key are shifted one over (?). 
Right now it looks like:
                        {
                            "type": "map_color",
                            "default": [
                                255,
                                255,
                                255
                            ]
                        }
                    ]```

and the texture shows up yellow, as if the blue channel were 0. I did some testing and found out: Red > (removed); Green > Red; Blue > Green. So instead of 255red; 255green; 255blue, it turns into 255(none); 255red; 255green and as you see blue is just not there and that's why it shows up yellow.
This is further proved by the value [225, 0, 0] which shows up black.

Am I doing something wrong or is this a know issue?