Poor Grasp of English
Many of these riddles are excellent but a substantial percentage appear to have been written by someone who speaks English as a second language or were written by someone who does not quite grasp the point of riddles. The object of a riddle is to provide RELEVANT information about the solution. Tricky word uses are great as are clues that dont have an obvious connection to the solution. However if the provided information has no connection with the riddle it isnt really a brain teaser - its a guessing game. Guessing games and riddles are quite different. My recommendation is to look back over the clues and solutions. Any riddles with clues that arent relevant need to be revised or replaced.
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A Year of Riddles