Hello @kayasandikodasi
Thank you for the support topic, It seems you are using AMP plugin in Reader Mode and You have selected Twenty Twenty One theme as you Reader Mode theme.
You can access your AMP pages using ?amp at end of URL
eg:
non-AMP Page: https://mersinikincielesya.net/
AMP Page: https://mersinikincielesya.net/?amp
You AMP page seems to be valid and has no issues.
However, we have noticed that you have added amp as an attribute in your non-AMP theme (main site theme) which is bad practice, Please remove that attribute from <html> tag
Hope this helps!
@kayasandikodasi
As we didn’t receive a response I’ll mark this as resolved. Feel free to open a new support topic if you require any further assistance.