Shutdown Karaf but the bundle stop is not follow the start-level

I set a bundle start level to bundles as this:
Name Level
bundle-a 81
bundle-b 82
bundle-c 83
When I use osgi:start-level 80, bundles closed as order 83,82,81 and this is what I expected.
When I use shutdown, bundles closed as order 81,83,82 and this tis not what I expected.
Could you make the bundles stop follow the reverse order of start level when karaf shutdown