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Yes, I did clear the cache, and no, they did not call within CSS.

Hey Hi…
Thank You For the help
Did you add any custom code in the customize? – No Zero Code

What is your PHP version? Try to upgrade it to the PHP 7 if it is not. – I’m using CMS WordPress so, I can’t manually upgrade PHP version.

Try to disable/enable plugin one by one to check a possible conflict. – Yes, I did then only I came to the conclusion Sticky Header Plugin itself making problem to header size on desktop.

Header look like this before activating Plugin

Header look like this after activating Plugin