Custom Metaboxes for Custom Post Type are showing on regular Pages Editor

UPDATE

just in case I haven’t been clear before. The custom meta boxes appear only on my custom post type edit screen, until I update any PAGE. Then, they all show up in all the regular Pages editor.

I just removed all my custom creations, deleted all custom metas from the database, went back to admin and updated a page. Everything ok.

then I created back the custom types and boxes, went to admin and the boxes were showing only inside the custom post type, until I just updated any Page and all the metaboxes came back to the screen after the update.

I also updated a POST and the same thing happened, the custom boxes appeared just after the update ??

OK I think it is solved:

the issue was that I was using this to save the metaboxes values:

add_action('save_post', 'player_savemeta');

function player_savemeta(){
	global $post;
	update_post_meta($post->ID, 'name', $_POST['name']);
	...etc...
}

The problem is that it was running the function for all posts saving actions, and so creating the custom boxes for every post.

The solution I found (not tested yet) is to check the post type before saving the metadata:

function player_savemeta(){
	global $post;
	if (get_post_type($post) == 'player'){
		update_post_meta($post->ID, 'name', $_POST['name']);
		...etc...
	}
}