Had a little trouble sorting out your post but here goes...

a) The way I understand it you had "four consecuitive stays" for two rooms each, correct?.
By the T&C of the HH program consecutive stays in the same property no matter how long is considered ONE stay irrespective of whether you made four or even eight separate reservations (the nights credit being the total number of nights spent in one room.

b) Basically you should get HH base points ( and the corresponding bonus points... depending on your My way selection) for the sum of the rate paid for all four rooms over the two nights.

c) Sometimes HH has trouble combining two room folios and the CSRs will just total the two rates for the two rooms and post it in one (folio).

However the total number of base points you receive should be the same overall.

mike