Varying behaviour when exiting vim depending on filetype (perhaps)

I've noticed that if I clear my terminal and edit files in vim,
sometimes when I exit I am still at the top of the terminal. Other
times vim drops me at the bottom.

I'm just curious why vim does this? My $TERM is screen-256color-bce.
I've tried setting the term variable in .vimrc but it doesn't seem to
make any difference.

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