Methane data struggle

I imagine you are looking at EO Browser?
One reason is probably filtering by QA filter that is used in EO Browser (see minqa parameter here).
The other reason might be in visualization, which is skewed towards large values. So small values might appear white.

I’d recommend you try using the service directly and then check the actual values, not just colors.

That being said, Sentinel-5P is pre-cursor satellite, so not meant for operational use (it’s very good though).