Bug with armor "stuck" in the air

[Tinien]

I ran into a bug with city guard armor which doesn't move when trying to grab it and move to other place. It just remains in its default position. It can be picked up in inventory, put into any container, sold. But when I drop any of this armor on the ground it is "stuck" in the air at fixed height and cannot be moved by dragging. Moreover, this piece of armor creates a collision, i.e. it becomes an obstacle which has to be gone round. This bug has shown up only in Bruma and its outskirts (I suppose it occurs in the cell exterior which includes Bruma, but vanishes outside this cell). This bug concerns only certain pieces of armor, specifically Guard Helmet, Bruma Cuirass, Chainmail Greaves, Chainmail Gauntlets, Chainmail Boots. All other types of armor (and weapon, shields and misc. items) don't subject to this bug. Well I haven't tried all of items in Oblivion so I cannot be sure 100%, but anyway all other types of armor lying nearby Bruma guards armor (in Bruma castle barracks, Bruma castle dungeon) were moved freely by grabbing. As I recall guards cuirasses of all other cities (excludes IC guard armor) brought to Bruma were also subject to this bug, but Bruma cuirass (and all other parts of city guard armor) brought to any other city (or any other location) were released from this "stick" bug. I have suspicion about Open Cities Classic mod, that it creates this "stick" bug. Below is the modlist and I will be grateful for any help or advice.

00  Oblivion.esm
01  Open Cities Resources.esm  [version 4.1.6]
02  SDR.esm  [version 9.000]
03  HorseCombatMaster.esm
04  Unofficial Oblivion Patch.esp  [version 3.2.0]
05  DLCShiveringIsles.esp
06  Unofficial Shivering Isles Patch.esp  [version 1.4.0]
07  DLCBattlehornCastle.esp
08  DLCBattlehornCastle - Unofficial Patch.esp  [version 1.0.4]
09  DLCThievesDen.esp
0A  DLCThievesDen - Unofficial Patch.esp  [version 1.0.5]
**  DLCThievesDen - Unofficial Patch - SSSB.esp  [version 1.0.4]
0B  DLCMehrunesRazor.esp
0C  DLCMehrunesRazor - Unofficial Patch.esp  [version 1.0.4]
0D  DLCVileLair.esp
0E  DLCVileLair - Unofficial Patch.esp  [version 1.0.5]
0F  DLCHorseArmor.esp
10  DLCHorseArmor - Unofficial Patch.esp  [version 1.0.5]
11  DLCOrrery.esp
12  DLCOrrery - Unofficial Patch.esp  [version 1.0.3]
13  DLCSpellTomes.esp
14  DLCSpellTomes - Unofficial Patch.esp  [version 1.0.1]
15  DLCFrostcrag.esp
16  DLCFrostcrag - Unofficial Patch.esp  [version 1.0.4]
17  Knights.esp
18  Knights - Unofficial Patch.esp  [version 1.0.9]
19  Open Cities Classic.esp  [version 4.1.6]
1A  Open Cities New Sheoth.esp  [version 2.0.1]
1B  Open Cities Outer Districts.esp  [version 4.1.6]
1C  OCC-KOTN-Patch.esp  [version 3.1]
1D  DeadlyReflex 5 - Combat Moves.esp
1E  Harvest [Flora].esp  [version 3.0.0]
1F  OCOD+FrostcragSpire Patch.esp
20  Harvest [Flora] - DLCFrostcrag.esp  [version 3.0.0]
21  Harvest [Flora] - DLCVileLair.esp  [version 3.0.0]
22  Harvest [Flora] - Shivering Isles.esp  [version 3.0.0]
23  HUD Status Bars.esp  [version 5.3.2]
24  SDR_Mechanics.esp  [version 9.000]
25  SDR_Oblivion.esp  [version 9.000]
26  SDR_Oblivion_noDDLS.esp  [version 9.000]
27  Enhanced Grabbing.esp  [version 0.5]
28  Bashed Patch, 0.esp

P.S. Plugins were sorted by LOOT. I know that BOSS is more preferred for Oblivion but on my Win 8.1 64x it doesn't work (I suppose OS forbids BOSS parsing files)

Edited October 29, 2016 by Tinien

[Oblivionaddicted]

The easiest solution is to replace the problematic gnd mesh with a working vanilla one. Otherwise I think you can also edit the mesh with NifSkope and add a weight to the glitchy gnd file.