Regions searched against incorrect theme

1. I don't know how to reproduce it.
2. I'm expecting to see my regions defined in mytheme.info, say, on admin/build/block and to see my blocks in my regions on site too.

3.
I've copied prod version of my site to my PC (files and DB dump with "mysql db_name < dump.sql", db_name was created first). Permissions (both filesystem and DB) are OK, all work fine except all my regions are lost with "The block [block_name] was assigned to the invalid region [region_name] and has been disabled" messages on the admin/build/block page. So all my blocks disappeared from site pages too.

I've investigated modules/block/block.module and there is a SQL query near line 235:

$result = db_query("SELECT * FROM {blocks} WHERE theme = '%s'", $theme_key);

where $theme_key contains "garland" which pointed as admin pages theme (by me), but my site uses my own theme and all my regions defined only for my theme. If I manually do that query to DB with my theme name instead of "garland" - I see my blocks with my regions.

Moreover, as I know, admin/build/block should use site theme, not admin pages theme, but I see it in admin pages theme.

Where I get wrong? May be there is some kind of misconfiguration (by me) of what?