The second one isn't a bug: It costs 50 admin points to move a PVO AA regiment to STAVKA.
12.2.3. Support Unit Attachment Change Cost
One admin point is expended when transferring a support unit between HQ’s, town, city or urban hexes, or units. There is normally no admin cost to transfer a unit of any kind from a High Command headquarters unit to another HQ, town, city or urban hex, or combat unit. The cost of transferring antiaircraft units from a city to a High Command headquarters unit, however, is 3 for an AA battalion, 10 for an AA regiment, 15 for a German LW or Soviet PVO AA battalion, and 50 for a Soviet PVO AA regiment.
Seriously -- why is it so expensive to relocate a PVO AA Regiment? These units typically consist of no more than two or three dozen light and medium caliber antiaircraft cannons. Conversely German LW FLak Regiments can be upwards of 200 lt, medium and hvy AAA guns. This isn’t a game breaker by any stretch, but the large AP cost associated with moving one of these PVO AA Regiments to the National Reserve is a source of curiosity.