Hi Jake
Can you confirm you are using lights from our Univseral lighting catalogue ? also that you are setting a theme in your designs? and what specific render are you using? for best results i would use either HQ Present or Hq Publish.
Please see below links to lighting videos on our youtube channel.
2020 Fusion Lighting Themes
2020 Fusion Lighting Management
If you wish to discuss further or need advice on a specific design, please give the 2020 Fusion support team call on 01233 635 533.