Hi James,
I hope you are well today and thank you for your question.
Please make sure that you are using below latest version of theme.
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This can be due to plugin conflict on your site so please try temporary deactivating all plugins except Unyson plugin and WpBakery page builder plugins and see whether everything works fine and then enable the plugins one by one to see which plugin is conflicting if any or use following plugin to check it.
https://wordpress.org/plugins/health-check/
Is the logo getting changed for you using theme options as shown in the attached screenshot?
Best regards,
Shufflehound team
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