I believe what you see is just how your specific printer handles printing light tints.
All commonly used printers can only ever print solid areas of ink.
The illusion of different tints is achieved by applying the ink in some kind of pattern. This method is called screening.
On offset print you will often see halftone screening. All dots follow the same pattern. The different tints come from the size of the dots.
On digital printers you will more commonly see stochastic screening. All dots have the same size. The different tints come from the frequency of the dots.
Your photo shows a stochastic pattern. The printers resolution sets a limit for how fine-grained the pattern can be. Perhaps it's possible to alter the printer's resolution setting to achieve smaller dots, but it's not possible to avoid this texture all together.