If two iBeacons are too close to eachother, could their signals get confused for one another?
iBeacon seems to be based of Bluetooth Low Energy (BLE).

As discussed here, Bluetooth devices cannot normally interfere with each others. They simply "wait" for their turn.

In your case, I guess they are "beacons", which are connecting and disconnecting frequently to devices to send data. Your issue might be that you are misunderstanding one beacon for another ? Or it might be software related.