Any idea what causes this artifacting on

[spark holly]

another pic closer up, getting this weird green on the wall for some reason

you can also see it in this view

[cunning glacier]

looks like compression artifacts

[sacred sky]

Compression artifacts can appear exaggerated if your lightmap is running out of resolution to use
That most often happens when your geometry has too many seams and when too many small or complex meshes are included in the baked lightmap

Generally only large furniture and objects bigger than those should receive lightmapping, the rest can be lit by light probes

Any objects too small to meaningfully contribute to baked shadows should not be GI static at all

[spark holly]

baked shadows should not be GI static at all
How do I disable them being GI static?

because I have all these bottles on a back bar which i guess dont need to be mapped, not sure how to remove them from the mapping though.

[cunning glacier]

you go to the static flags dropdown for a gameobject and uncheck the gi static

[spark holly]

ah thank you

[cunning glacier]

the lighting wont match as well of course but if you have light probes in your scene, you can use the anchor override field on the mesh renderer to pick a point in your scene where the lighting looks best and matches for those bottles in the shelf

[sacred sky]

Light probes are a must in these situations