The controlling quest in Broken Oar Grotto (dunBrokenOarQST) never gets shut down properly. As a result, the Blackblood Maurader's corpses are never properly cleared out of the cave. See the papyrus output below:
sqv dunBrokenOarQST
**Papyrus**
QF_dunBrokenOarQST_0001E437:
Script state = ""
::Alias_CaptainHargar_var = alias CaptainHargar on quest dunBrokenOarQST (0001E437)
::Alias_chattyNPC1_var = alias chattyNPC1 on quest dunBrokenOarQST (0001E437)
::Alias_chattyNPC1Start_var = alias chattyNPC1Start on quest dunBrokenOarQST (0001E437)
::Alias_chattyNPC2_var = alias chattyNPC2 on quest dunBrokenOarQST (0001E437)
::Alias_chattyNPC2Start_var = alias chattyNPC2Start on quest dunBrokenOarQST (0001E437)
::Alias_DuringQuestNPC1_var = alias DuringQuestNPC1 on quest dunBrokenOarQST (0001E437)
::Alias_DuringQuestNPC2_var = alias DuringQuestNPC2 on quest dunBrokenOarQST (0001E437)
::dunBrokenOarLootEnableMarker_var = (000BABBC)
::dunBrokenOarRespawnEnableMarker_var = (000BABC5)
::dunBrokenOarTalky01_var = None
::dunQuestScene_var = (000BABC2)
- 7 Aliases for quest 'dunBrokenOarQST' (0001E437)-
REF 'chattyNPC1'-> '' (000BAB8D)
REF 'chattyNPC2'-> '' (000BAB90)
REF 'CaptainHargar'-> '' (0002C486)
REF 'DuringQuestNPC1'-> '' (000BABBE)
REF 'DuringQuestNPC2'-> '' (000BABBF)
REF 'chattyNPC1Start'-> '' (000BABB3)
REF 'chattyNPC2Start'-> '' (000D1EEE)
--- Quest state -----------------------------
Enabled? Yes
State: Running
Current stage: 100
Priority: 30