@sharijs: Hello sharijs, It is because of the text section appearing on other pages which is making the header image size different can you put some text in home page header media section, You can follow this steps: Go to=> Appearance=> Customize=> Header Media=> Header Media Title=> put some text
Also you have to disable the summary section div in home page in order to make the header image same size as other pages. Please follow this steps and insert this code
Go to=> Appearance=> Customize=> Additional CSS=> add the following css code
.home .custom-header-content .entry-summary{
display: none;
}
let me know if this works out!
Kind Regards,
Sapana