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Found the Problem! 😀

Here’s the fix:
– Open \wp-includes\query.php

Search for this Function:

$search_orderby = apply_filters( 'posts_search_orderby', $search_orderby, $this );
if ( $search_orderby )
            $orderby = $orderby ? $search_orderby . ', ' . $orderby : $search_orderby;

…and replace it with:

$search_orderby = apply_filters( 'posts_search_orderby', $search_orderby, $this );
if ( $search_orderby )
            $orderby = $orderby ;

Also search for this Function:

// Paging
if ( empty($q['nopaging']) && !$this->is_singular ) {
            $page = absint($q['paged']);
            if ( !$page )
                        $page = 1;
            if ( empty($q['offset']) ) {
                        $pgstrt = absint( ( $page - 1 ) * $q['posts_per_page'] ) . ', ';
            } else { // we're ignoring $page and using 'offset'
                        $q['offset'] = absint($q['offset']);
                        $pgstrt = $q['offset'] . ', ';
            }
            $limits = 'LIMIT ' . $pgstrt . $q['posts_per_page'];
}

…and replace it with:

// Paging
if ( empty($q['nopaging']) && !$this->is_singular ) {
            $page = absint($q['paged']);
            if ( !$page )
                        $page = 1;
                        if ( empty($q['offset']) ) {
                        $pgstrt = ($page - 1) * $q['posts_per_page'] . ' ROWS FETCH NEXT ';
            } else { // we're ignoring $page and using 'offset'
                        $q['offset'] = absint($q['offset']);
                        $pgstrt = $q['offset'] . ' ROWS FETCH NEXT ';
            }
            $limits = 'OFFSET ' . $pgstrt . $q['posts_per_page'] . ' ROWS ONLY';
}

I didn’t write down the Link, where I found this Fix. But its working for me.