The sun colored your product.
And to keep it that way here some sunmilk for your bag.
Treat your product with this (UV) lotion for vegetable tanned leather.
The UV in the lotion protects the print on you’re bag.
When using other leather treatments, always test the product in an inconspicuous area of your bag first before applying to the entire bag. Avoid leaving your bag in direct sunlight, which may change the colour of your bag.
Also – it will dry out over time, and the lotion will maintain the moisture.
Be zealous during rainy season! Try to avoid heavy downpours because leather is permeable and can never be entirely waterproof.