In vim, background color changes on scrolling

As explained here and here, you can fix this by turning off Background Color Erase. Change in your .vimrc:

if &term =~ '256color'
    " Disable Background Color Erase (BCE) so that color schemes
    " work properly when Vim is used inside tmux and GNU screen.
    set t_ut=
endif

You can also type Ctrl+L to reset the screen.

In vim, background color changes on scrolling

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