ctermbg different depending on terminal

Hello,

I have two terminals that I use -- xterm and urxvt.

If I open up vim in urxvt, the "Visual" highlighting is this:
Visual         xxx term=reverse ctermbg=7 guibg=LightGrey

If I open up vim in xterm, the "Visual" highlighting is this:
Visual         xxx term=reverse cterm=reverse guibg=LightGrey

If I open up vim in Terminator, it's the same as in Xterm

Where does the ctermbg=7 come from when I'm in urxvt?

Thanks
--Nate

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