Scrolling and highlight display not functioning correctly

[jrwrigh]

There are two main issues I'm submitting here, both to do with how the display changes with interaction.

As a demonstration, please see the imgur album with two gifs.

Highlighting

The first is random block highlighting that happens when you move around. See screenshot below for more specific details

In the "Status" window, the two green blocks circled shouldn't be there, as the "Changes no stages for commit" line is the one selected.
In the "Diff for unstages files" window, I'm not sure what the red and green blocks are attempting to highlight.

Scrolling

Best demonstrated in the gifs, there is some really odd behavior where the program is not writing the screen correctly.

In the first gif, simply going up and down on the "Status" window causes the "Diff" window to creep upwards, then eventually just repeat the same 4 lines of the file over and over.

In the second gif, scrolling down works fine, but if I try and scroll up, only the top ~10 lines of the window actually change.

System Info:

$ grv --version
GRV - Git Repository Viewer v0.3.2-0-g13658da (compiled with go1.11.5 at 2019-03-15 22:05:45 GMT)

grv is running on top of zsh in a tmux window. This is being run through SSH on a server running RHEL.