LOOT load order

[noir_78]

When I let LOOT sort my load order it will sometime drop .esm files below .esp files.

 

Spoiler

0  0     FalloutNV.esm
  1  1     DeadMoney.esm
  2  2     HonestHearts.esm
  3  3     OldWorldBlues.esm
  4  4     LonesomeRoad.esm
  5  5     GunRunnersArsenal.esm
  6  6     ClassicPack.esm
  7  7     MercenaryPack.esm
  8  8     TribalPack.esm
  9  9     CaravanPack.esm
 10  a     YUP - Base Game + All DLC.esm
 11  b     MikotoBeauty.esm
 12  c     T6M NPC NV.esm
 13  d     ELECTRO-CITY - CompletedWorkorders.esm
 14  e     Project Nevada - Core.esm
 15  f     Project Nevada - Equipment.esm
 16 10     ELECTRO-CITY - Highways and Byways.esm
 17 11     Niner.esm
 18 12     T6M Equipment Replacer NV.esm
 19 13     Project Nevada - Rebalance.esp
 20 14     NVWillow.esp
 21 15     Project Nevada - Cyberware.esp
 22 16     NevadaSkies.esm
 23 17     YUP - NPC Fixes (Base Game + All DLC).esp
 24 18     T6M NPC OWB Loot.esp
 25 19     Project Nevada - Honest Hearts.esp
 26 1a     Project Nevada - Old World Blues.esp
 27 1b     Project Nevada - Lonesome Road.esp
 28 1c     Project Nevada - Dead Money.esp
 29 1d     Project Nevada - Gun Runners' Arsenal.esp
 30 1e     T6M Honest Herts Replace.esp
 31 1f     T6M Old World Blues Replace .esp
 32 20     OWB HeadGear MOD Hair Fix.esp
 33 21     T6M Dead Money Armor.esp
 34 22     Type 6.esp
 35 23     CASM with MCM.esp
 36 24     The Mod Configuration Menu.esp
 37 25     MikotoBeauty.esp
 38 26     Conelrad 640-1240.esp
 39 27     TLD_Travelers.esp
 40 28     MoreNiner.esp
 41 29     AutumnLeaves.esp
 42 2a     T6M Unique Item.esp
 43 2b     T6M Unique Itam PN addon.esp
 44 2c     T6M NPC PN Addon.esp
 45 2d     NevadaSkies - Ultimate DLC Edition.esp

Currently NevadaSkies.esm is below three .esp files. It was worse before but I manually moved some .esm files back up and ran LOOT again to see if it freaked out.

I thought the rule was esm before esp. Or is that a grey area?

 

Edit: FOMM says Project Nevada - Rebalance.esp, NVWillow.esp and Project Nevada - Cyberware.esp has a .esp extension but its file header marks it as a .esm

Whats the point?