Hi @Sarah27327065ebuk , I don’t think this is a new issue, the InDesign Color Picker is displayed in your Monitor RGB profile, not the document’s assigned RGB space (sRGB in your case). So when you pick an RGB color and use it as a fill there is a change in appearance from the picker’s Monitor RGB to Document RGB.
I checked earlier versions and it has always worked that way. InDesign is unique in that it allows you to mix colors in HSB/RGB, Lab, or CMYK spaces within the same document—it doesn’t restrict you to a single color space the way Photoshop and Illustrator do.
The Swatches and Color panels (where you are picking a single color mode) do display in the document’s assigned profiles. Here my document is assigned sRGB, and you can see my fill matches the Color and Swatch patches, but not the Color Picker:
If I set my document’s assigned profile to Monitor RGB, the Color Picker matches:
It’s even more obvious if I assign an extra large gamut profile like ProPhoto: