Customize 'Add your CSS' not working

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Hi there,
Could anyone help with this issue?
I have moved my site to another VPS and after getting the site online, I can not alter the text styles via Themes > Customize > Add your CSS. The Customize theme preview does display the changes I have made to the 'Add your CSS' window, but after clicking on the save button at the bottom of the page then going back to the website, there is no change. Even after refreshing the page several times, clearing cache, browser caching etc. the pages have not changed at all.
Can anyone help me resolve this issue please?
Thank you in advance.

 

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