It might be a mod conflict, but I'm not completely convinced. Mid level (20-25 range) wastelands robots don't seem interested in fighting. Mr. Gutsy and Sentry Bots both seem to notice I'm in front of them, but refuse to attack. I disabled all of the Mods in my list except MCM and oHud (my save refuses to load without them for some reason), but I imagine there might be something in the background (maybe a script or something?) that still effects the bots.
They do not fight back no matter who attacks, and Sentry Bots refuse to even move (occasionally they might rotate in place, but do not attack). I've tried kill/resurrect, disable/enable via console, making a clean save next to a Sentry Bot in full [DANGER] and resuming the game, no difference. I've also noticed that the Robotics Expert perk does nothing for them (But it does work on turrets and quests).
[collapsed title= Load Order]
FalloutNV.esm=1
DeadMoney.esm=1
HonestHearts.esm=1
OldWorldBlues.esm=1
LonesomeRoad.esm=1
GunRunnersArsenal.esm=1
CaravanPack.esm=1
ClassicPack.esm=1
MercenaryPack.esm=1
TribalPack.esm=1
Fallout3.esm=1
Anchorage.esm=1
ThePitt.esm=1
BrokenSteel.esm=1
PointLookout.esm=1
Zeta.esm=1
TaleOfTwoWastelands.esm=1
oHUD.esm=1
ArmorReplacers.esp=1 (texture/mesh replacers, shouldn't affect robots at all)
TTW_XPReduction.esp=1
TTW_MoreCookingItems.esp=1
TTW_StashPackOptions.esp=1
TTW_Bobbleheads.esp=1
The Mod Configuration Menu.esp=1
Realistic Portable Tent.esp=1 (TTW patched version)
friendofnightforfellout.esp=1 (perk fix for darker nights)
Auto Aim Tweaks 1_0.esp=1
LFox Bottle That Water.esp=1
LFox Cannibal Perk Improvements.esp=1
SoftDrinksRestoreDehydrationRevamped.esp=1
Fatigue - Loot the Unconscious.esp=1 (only works on NPCs)
Fixer - Temporary Addictions.esp=1
ImmersiveHealthNV.esp=1
ManualReload.esp=1
ManualReload-OldWorldBlues.esp=1
SnowGlobePerks.esp=1
SpottersBinocs.esp=1
Tuckered Out.esp=1
ProjectRealityMkIv5HDR.esp=1
ttwsydneyfix.esp=1 (changes Sydney's ai package to stop being a follower if Stealing Independence is completed, modified for 2.2a)[/collapsed]