Different Headers on different pages

Hi there,

I have recently edited the main menu to include a direct link to whatsapp so Clients may contact us directly.

However, I am experiencing different types of headers at different pages within the website after the edit. Have tried looking through the Main Menu settings but am unable to find the reason. Have provided 2 links below of the header but notice the difference when you hover over the top right menu “HP: 8304-7575”. One brings you straight to the whatsapp number while the other is stationary.

Also, I have noticed that the plugin “Whatsapp Me” is not working on every page of the site.

Thanks so much for your time.

Regards,
Jeremy