Blotchy Shading?

Hi all, I have this shading problem with my lighting. I have tried larger lightmaps (up to 4k) but that doesn’t seem to change my results. I have also tried changing lighting quality but to no avail. Below I have attached a screenshot with a edited high contrast version so you can clearly see the issue. Any ideas on what could be causing this?

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Thanks in advance if you can help, luv ya