Issue description:

Opening the detector does not immediately cause the item count to show correctly, but instead shows the item count for the last detector opened first.
Upon re-opening the interface, the correct amount is displayed.

Steps to reproduce:

Place down two or more detectors with different item counts and open them one after another
GIF of issue happening

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

• Minecraft: 1.15.2
• Forge: 31.1.0
• Refined Storage: 1.8.1

Does this issue occur on a server? Yes.