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Sorry to hear you’re facing problems 
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Some or all of the below information will be requested if it isn’t supplied; for fastest response please provide as much as you can 
Nextcloud version (eg, 20.0.5): 25.0.3.2
PHP version (eg, 7.4): 8.0.27
The issue you are facing:
I changed the Nextcloud Theming colour, but it only seems to apply to any new accounts created, the original account remains on the default colour.
Steps to replicate it:
- Enter Admin Option
- Go to Theming panel and change the colour
- Observe