Bundles with more than two rows of items don't fill up empty spaces with new items

The Bug:

Bundles with more than two rows of items don't fill up empty spaces with new items.

Steps to Reproduce:

1. Fill a bundle with 16 items.
2. Take out 2 items and observe the bundle tooltip and observe how there are two empty spaces despite the tooltip saying +X.

Observed Behavior:

Bundles with more than two rows of items don't fill up empty spaces with new items.

Expected Behavior:

Bundles with more than two rows of items would fill up empty spaces with new items.