Issue description: more the 1 item in the filter grid hides all items in the system.

What happens: Placing more than 1 item in the grid filter filters out all items in the storage system. Having only 1 item works, but multiple items doesn't.

What you expected to happen: The grid filter to hide all items but the items in the grid filter.

Steps to reproduce:

1. place 2 or more items in a grid filter
2. place grid filter inside grid
3. see empty grid
   ...

Version (Make sure you are on the latest version before reporting):

• Minecraft: 1.10.2
• Forge: 12.18.2.2179
• Refined Storage: 1.2.11

Does this issue occur on a server? [yes/no] yes

If a (crash)log is relevant for this issue, link it here: no crash log

[pastebin/gist/etc link here]