Unable to Increase Size of Mobile Header Logo

Hello @pank6119,

Logo or any images should have with or height.
If you set a custom width, then you must set height: auto or unset it.
and reverse. Since you are set both of them, unset the width or height and recheck the issue.

For example, if you set the width to 250px, it’s enough, you do not need to set height and max-height.

Also, I can see you set width and height everywhere, so you can remove the logo settings from metaboxes and only use customizer header > logo: https://postimg.cc/7G5GWdRz.

Or use custom CSS:

@media (max-width: 480px) {
    #site-header #site-logo #site-logo-inner a img,
    #site-header.center-header #site-navigation-wrap .middle-site-logo a img {
        max-width: 150px !important;
        width: 150px !important;
        height: auto !important;
        max-height: auto !important;
    }
}

Best Regards