In translating the psalms, there is an added complexity as you recognize in your questions. We want our translation to handle poetry beautifully - but we also want to translate the Hebrew accurately. Obviously translations try to do both, but at some points will have to choose - and often poetry wins out over accuracy. For example, in Psalm 1:3 everybody renders it something like "a tree planted by streams (or rivers) of water", but there are no streams in Israel and the Hebrew word for river is quite different (nahar). A peleg (which is the Hebrew word here) is more like a canal or channel, usually man-made. Nobody disputes this meaning but "He is like a tree planted by canals of water" just doesn't sound very poetic...
On the plus side, those "poetic inaccuracies" make sure that preachers still have something to do: it is not just chance good fortune that placed the tree where it is - it has been deliberately put there by the gardener, who planted (or perhaps even transplanted) it in a location where he ensured it would be provided for by suitable irrigation.