Vim selection underlined rather than reversed

Sometimes, after I attach to a tmux session, visual selection in an already-running vim instance is shown as underlined instead of reversed. See the attached files for the difference; both are from the same host - one from new, and the other from existing session. The only way out I've found is to quit and launch vim again. Does any one know why this happens and/or how to fix it?

This is the same problem as someone had posted a while ago: https://superuser.com/questions/1186500/vim-visually-selected-text-sometimes-appears-as-underlined-not-reversed

Thanks,
Jeenu

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