Render is Not Working

Kayley✨ W💜 21 May

I've tried rendering one of my designs several times now and I get the same thing: the windows are covered in black staticky stuff and one of my couches is missing and only the bottom rim part of it is showing up. Overall the renders are low quality. I've tried rendering from different positions and switched computers but it is still not working. Does anyone know how to fix this?

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