HDMI from external device as inputs on TV?

[HarmlessSaucer]

Hey everyone,

Can someone tell me if I'm going crazy?

I've had this LG 

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 TV for a while now.  I use it with my   surround sound system, connected via HDMI ARC and it's great.

The LG TV only has 3x HDMI, one of which is used by the surround sound.  The surround sound has 2x HDMI inputs that I can use, and switching to it on the TV, and then switching it's inputs allows me to effectively have 5x HDMI in my system, which is pretty good!

I'm SURE that at some point when I was setting up the TV and surround sound together, I noticed extra devices in the input menus on the TV - like the TV was "seeing" the devices that the surround sound had on offer.  
Am I imagining things?  Or is this a possibility?  If so, how the heck do I get it to work again?

 

Thanks!