[Koha] Inventory changed?

Hi all Has the inventory changed radically? It works very differently as it used to. I have my call numbers in the form of: "1/ 1, 1" (the first digit beeing the group, the second the shelf, the third a serial number). When I used "4/43, 1" and "4/43,99" as limits of the search I got a list like: 4/43, 1 4/43, 2 and so on. Now I get 4/ 4,30 4/ 4,31 until: 4/ 4,39 and then: 4/43, 1 4/43, 2 and so on. The second difference: Until recently the inventory showed all the items on the shelf. Now only the items having a valid item type (field 943 c) are shown (I have many records without item type, because I made a mistake when I imported the records from my old system). Is there a way to have the "old" behaviour back? Beda