Camera Washes Out Color In Close Up Photos of Large Similar Color Areas

This has been a problem with all my iPhone cameras. Same issue with iPhone 7 and my new iPhone14Pro. I'm shooting fabrics on a table top, usually if I leave a section of the image with a light background I'm okay - but if I move in for a close up on the fabric the color all washes out. I'm shooting in RAW now hoping that would help but even then this happens. Here is an example. I shot the image on the left, then just moved a bit closer and the color washed out. Sometimes if I move really fast between aiming at the floor and back to the table I can catch the color - otherwise all the true color saturation is lost..... Is there a setting I can use?

Below I shot the fabric with lots of lighter canvas behind, looks great, moved to the right slightly all the color saturation is gone?