Why do you at Yahoo put questions that do not fit a specific category into categories that you know don't fit?

No one at Yahoo puts questions anywhere. A small computer program makes a guess, based on key words in your question. Most of the time it guesses right, When it doesn't you have the final say as to what category it is placed in.

To quote the help page: Click Edit Category to select where your question fits best.

Yahoo run a computer program that identifies certain keywords in the question and then initially allocates it to what is the best fit for those keywords.

However being a computer it makes classic errors. Someone asked a question asking for help to identify an insect but called it a 'beetle". The question ended up in the "Volkswagen" category. Clearly wrong.

What you need to do is just check the initial category the computer allocates it to and if it is not suitable, then EDIT the category and select your own choice. Click the blue edit button, click on edit categories, click on "ALL" and this will bring up the categories and then click on a suitable one followed by a sub-category if relevant. Don't forget to click on "submit".

Please note that in addition to the initial posting Level 7 users have the ability to change categories also. If you find that someone subsequently changes the category to one that you do not approve of, then simply change it back by editing the category again yourself. It is also recommended that you place a note on the question requesting that the question remains in the category you prefer, to prevent Level 7s moving it in good faith again. If it is still moved by a malicious Level 7 troll then please report it to yahoo

it sorta just predicts it iguess