diff --git a/includes/class-wc-post-data.php b/includes/class-wc-post-data.php
index 36085196caa..e641088de5e 100644
--- a/includes/class-wc-post-data.php
+++ b/includes/class-wc-post-data.php
@@ -245,7 +245,7 @@ class WC_Post_Data {
 			wp_cache_delete( 'product-' . $object_id, 'products' );
 		}
 
-		if ( ! empty( $meta_value ) && is_float( $meta_value ) && in_array( get_post_type( $object_id ), array_merge( wc_get_order_types(), array( 'shop_coupon', 'product', 'product_variation' ) ), true ) ) {
+		if ( ! empty( $meta_value ) && is_float( $meta_value ) && ! registered_meta_key_exists( 'post', $meta_key ) && in_array( get_post_type( $object_id ), array_merge( wc_get_order_types(), array( 'shop_coupon', 'product', 'product_variation' ) ), true ) ) {
 
 			// Convert float to string.
 			$meta_value = wc_float_to_string( $meta_value );