Since cryptic and thought-provoking poems (just for example) very often share the same hashtags, it is possible that the same poems appear under multiple hashtags. Nevertheless, the hashtag categories are different and contain different poems as well. So, if you find under two (or even three) hashtags some doubled poems, just ignore them and read the next one.
If you think that a certain poem should be found under different hashtags, write me and I will check your specifications (and of course improve it afterwards if necessary).