Wordpress, custom logo and site title

In some cases, either buggy  code (both in html/css or the built-in editors), causes lay out issues.
In those case, revert to the latest "working" layout (with only the logo probably needing modification), then find the correct "logo to be replaced" file, and overwrite that file with your logo (keeping the old file name), BUT MAKING SURE the dimensions are exactly the same (otherwise you might introduce the layout errors again).

When you switch from the main theme to the child theme, my understanding is that any existing theme options that you've set aren't brought through to the child theme. Could that be the cause?

Thanks guys for your replies.
@Kimputer: actually, there is no an 'original logo'; in the admin panel, under Identity page I have the option to place a logo and it looks like the logo and the site title are mutually exclusive

@Terry: don't think that be the problem: in Identity page I have both the logo and the site title but only the first is displayed in the page; if I remove the logo the site title appears again.

Oh no, I was wrong: if I remove the logo the site title is no more displayed: the right text is displayed in the text box to set it up, but it is not displayed in the page!

Hi Kimputer. I did wht you suggest and I discovered that the source code really made logo and site title mutually exclusive:

	if ( ! empty( $check_logoset[0] ) ) {
	   if ( function_exists( 'the_custom_logo' ) ) {
			$output = get_custom_logo();
		}
	} else {
		if( display_header_text() ) {
			$output .= '<a rel="home" href="' . esc_url( home_url( '/' ) ) . '">';
			$output .= '<h1 rel="home" class="site-title" title="' . esc_attr( get_bloginfo( 'name', 'display' ) ) . '">' . esc_html( get_bloginfo( 'name' ) ) . '</h1>';
			$output .= '<h2 class="site-description" title="' . esc_attr( get_bloginfo( 'description', 'display' ) ) . '">' . esc_html( get_bloginfo( 'description' ) ) . '</h2>';
			$output .= '</a>';
		}
	}

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Thank you

Thank you

Can you take a look at this question? https://www.experts-exchange.com/questions/28961725/Wordpress-understanding-links.html

Sadly, I chalk this one up to maker of the theme. As much as he put in much of his time, he should have guided you by either having some information on the admin page where you fill this info in, or by using radio buttons where you can conclude yourself, that is was indeed mutually exclusive (so it would have saved you digging through the source code).