Freezing wetek box and random channel change

My cousin arrived home two days ago for Christmas and brought along his wetek play box, I copied my openelec micro SD settings/configurations to another SD card for his use.
Current Home set up:

Sky UK satellite dish with quad LNB
Two wetek boxes
Two Micro SD card with OE6 installed
I am experiencing the following issues:
Using win32 disk imager to create a backup my 8GB micro SD openelec settings but the backup file size grew from under 300mb to about 7.6GB
My cousin’s box do not have EPG
When I change channel on one box, it will randomly change channel on the second box. E.G. if I am watching ITV on my box and my cousin is watching Channel 5 on his, when I change channel on my box, it will automatically change channel on his box from channel 5 to a different channel, also if im scrolling through the channel list, my actions will be showing on his TV screen
Both Boxes freeze quite often, no network activity, no response to the remote control, whatever that was on the last screen simply froze there, I have to pull the power cable to restart it
On Tvheadend web interface > status> stream: only one input is available instead of two. On tvheadend web interface>configuration> TV adapters: I can see two adapters available.
On tvheadend web interface> configuration> channels/EPG>Bouquets: my box have 722 channels available but his box have only 172 channels
sometimes when I switch to a channel, e.g. ITV evening news, programme from another random channel will be showing.
Any idea how to resolve these issues please, help will be appreciated.

Thanks guys, any Idea how I can force tvheadend to use the two tv adaptors? And also force a channel rescan?
Tvheadend on my box have 720 channels on Astra 28.2e but cousin's box can only pick 132 channels

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codar you are correct with about the RCU, it interfere with each box (it uses radio) so I have now bought two Logitech k400 keyboard and two 32GB mSD cards.

Copied my backup to the new cards, everything working ok except that one box does not load EPG.

I forced a “rescan” and “trigger OTA EPG grabber” on Tvheadend for both boxes, however the box that does not load EPG, can only pull 117 channels from the rescan as against 722 channels on the box that load EPG.

Any ideas what the problem might be codar and mach1 and how I can get EPG to load please.

How do I assign the tuners please?

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