The Vacuum Hopper and XP Bottler both ignore the orientation that they were placed in when using the configuration GUI. They always assume that the "front" of the block is facing south.

Relevant versions:
OpenBlocks: 1.1.0-forge9.11.0.883-snapshot-0 (built from commit 40b028b)
OpenPeripheral: 0.2.1-preview8
Forge: 9.11.1.916

Heh. Fair enough! :-)

Yup not so much a bug, just.. not yet been implemented! on my todo list :)

Sorted!