Using number keys in normal inventory cause the item under the cursor to swap with that slot in your hotbar. Attempting to do this from within your ME inventory, via the Wireless Crafting Terminal with the Infinity Booster Card installed, pulls the Infinity Booster Card out of the Wireless Crafting Terminal and into your inventory.

(This is mainly annoying because there doesn't appear to be a way to stick it back in without going back to an ME Wireless Access Point.)

Wireless Crafting Terminal 2
Version: 1.10.2-0.1.31