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Flow in dead end pipes

I am encountering small amount of flows in dead end pipes. I filtered my pipes by selecting all pipes that have flows smaller then 0 so that i could find all the negative flows. and what i noticed was there were still some values that were equal to 0 after filtering. So I changed units and formatting to 10 decimal place and found that these values were not 0 but had a very small amount of flow. This is confusoing since these pipes are all dead end pipes with no customer meters / demands attributed to them. Is there a explanation for this?