How to solve the following wrong display problem?

[yxchng]

[andreas-bulling]

same problem here

[synchronizing]

Same issue on my end.

#20 indicates that there are dependencies that doesn't come preinstalled out of the box. Adding the following into my~/.vimrc file resolved the issue (you may also chose other separators -- check README.md for more details):

let g:tmuxline_separators = {
    \ 'left' : '',
    \ 'left_alt': '>',
    \ 'right' : '',
    \ 'right_alt' : '<',
    \ 'space' : ' '}