The "timeframe" tag added to all the decade related plot keywords

May I ask: Why?

Why turn perfectly satisfactory existing keywords redundant while forcing such unwieldy looking and sounding keywords down our throats? A simple keyword like "1980s" is enough to denote that the film is set in, and is in some way representative of, that decade. We don't need an additional word like "timeframe" to know that it denotes a time frame - it is self-explanatory in itself!

Worse thing is, I cannot even delete or correct these timeframe keywords. They are like those sticky posts on a forum.