This is probably due to #465

Versions

Betweenlands version:

Release 3.3.1

Forge version:

Forge 1.12.2-14.23.2.2611

Singleplayer or Multiplayer:

Singleplayer.

Installed mods:

Appleskin 1.12.21.0.9
B.A.S.E 1.12.2-3.5.1
Better Fps 1.4.8
Better Placement 1.0.0-1
Chunk Pregenerator 1.12 1.7
Client Tweaks 3.1.2
Clumps 3.0.0
FastLadderClimbing 0.1-146
FoamFix 1.12.2-0.9.4-Anarchy
FPS Reducer 1.12.2 1.9
Friendly Fire 1.5.8
Hot Swappable Armor 1.0
InventoryTweaks-1.64-dev
Keyboard Wizard 1.12.2-1.5.3-b1
Macro Key 1.1.6.3
Mouse Tweaks 2.8
Nature's Compass 1.5.1
Ninja's Mods 1.12
Optifine 1.12.2 C8
StepUp 4.0-mc1.12
SwingThroughGrass 1.12.2-1.2.3
TapeMouse 1.1.3.17
Texture Fix 4.0
The Betweenlands 3.3.1
Waila/Hwyla 1.8.23
XYZing 1.0

Description of the problem

How to reproduce:

1. Place a slope facing the side.
   

2. Place two more slopes facing forward to either side of it.
   

Expected result:

For the texture to be applied normally.

Actual result:

It seems to rotate the texture 90 degrees clockwise.

More Pictures:

Works as intended. That's just how the slopes can connect to allow for things such as this: