Wp_query arguments strange problem.

Hello wordpress community!

I have a problem with my query argumentation. I use a custom fields text to output a value(a price) and this value is an String type. example value: “1500”

So, I would sort my post with a ‘compare’ => ‘between’.

The code below display my post where price is between 450 and 900. But whe I want to set my argument to go in example from 450 to 1400, it won’t display somthing more even if there are post with this prices.

When I use “between” with hundreds numbers it works fine. But when I use 1000 and above, it won’t display anything.

Is there a problem because I use string with number inside?

$args = array(

		'post_type' => 'objets-a-louer',
		'posts_per_page' => '-1',
		'meta_query' => array(
			'relation'=>'AND',
			array(
			'key'     => 'obj_louer_loyer',
			'value'   => array( '450', '900' ),
			'compare' => 'BETWEEN',
						)
		), 

	);

Thank you in advance!