Prop `className` did not match. Server: "css-1l1ns9g-ButtonBase" Client: "css-1gjedn4"

I am using ACE/react and receiving an error in the chrome developer console that I really do not understand:

/gateway/api/engage-targeting/api/v2/user/359f68d6-096a-4f90-8e67-4ba47e1b3f86/messages/confluence-space-navigation/start:1 Failed to load resource: the server responded with a status of 409 ()
Deliveries:1 Uncaught (in promise) DOMException: Failed to get ServiceWorkerRegistration objects: The document is in an invalid state.
react-dom.development.js:82 Warning: Prop `className` did not match. Server: "css-1l1ns9g-ButtonBase" Client: "css-1gjedn4"
    in a (created by Context.Consumer)
    in ForwardRef (created by ForwardRef)
    in ForwardRef (created by ForwardRef)
    in ForwardRef (created by Consumer)
    in Consumer (created by ForwardRef)
    in ForwardRef
    in ForwardRef (created by ForwardRef)
    in ForwardRef (created by Context.Consumer)
    in ForwardRef
    in li (created by Context.Consumer)
    in ForwardRef
    in Unknown (created by v)
    in ol (created by Context.Consumer)
    in ForwardRef (created by ForwardRef)
    in nav (created by ForwardRef)
    in ForwardRef (created by Consumer)
    in Consumer (created by ForwardRef)
    in ForwardRef
    in ForwardRef (created by v)
    in v
printWarning @ react-dom.development.js:82

I am pretty new to react but i replaced my component with displaying simple static text only and it is still there.

Could anyone point me to what the issue might be?