Why my bash prompt is getting bugged when I browose through history?

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http://unix.stackexchange.com – Often when I start looking at history of commands some of chars from command displayed aren't erased, for example: Whats happening: prompt$ some_command prompt$ some_commanother_command What should have happened: prompt$ some_command prompt$ another_command I can't erase those chars and bash ignores them when executing command, also they disappear when new prompt is being displayed (after pressing enter for example). I asked other people who work on linux at my workplace and they said that they have that problem sometimes too, but they didn't have idea how solve that issue. I have ubu (HowTos)