I'm building a custom component, and on initial install on Joomla 3.3.6 it installs properly. However, when I install again, rather than running the update sql only from the current version+, it apparently is executing ALL the update sql files from the very beginning.

In the `jos_extensions` table, my component's `manifest_cache` show the version at `"version":"3.3.2"`-- this *should* mean that only sql update files 3.3.2+ should execute on upgrade. However, every update is being executed.

Can anyone think of a reason why this is happening? 
Thanks for any ideas.