why are the questions that i am asking going into random categories ex: I write a taco bell question and it goes to finance or something?

Because you aren't including enough keywords to get it placed in Dining Out>Fast Food. The system deals with questions from around the world, so is probably not programmed to know what Taco Bell is. It's easy enough to relocate any question you ask that goes into the wrong category. You can also preface your question with "Dining out: <question>" or "Fast Food: <question>". 

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Moving your question can be done by clicking Edit (pencil icon for mobile)>Edit category just beneath your question, then selecting the category that's appropriate for the topic.

Change the category. 

Technical answer:  Something something algorithm something something phrase recognition software something something based on similar previous posts.

Real Answer:  Low budget software package coupled with lazy site admins.

Because the algoritm will never be smart enough to always get it right.

If a question lands in the wrong category, click "edit" and "change category" to put it in the right one

Yahoo can sometimes be stupid when it comes to categorizing. Sometimes you just have to do it yourself.

It's Due to the Words that you have used in your Question the Computer thinks it goes to that Category 

You can Fix any Questions that go to Incorrect Category's by going to your Question click Edit then Click Edit Category and Select the right one for It 

If you know this is happening then why are you too lazy to check and make sure that they post in the right section?

The computer programs use keywords in your question and updates to Try to determine which subcategories to post your questions. If you want your Taco Bell question to go I to the Fat Food sub subcategory, put the key words " fast food" in your question or an update to that question. Your question CAN go into multiple subcategories.

a yahoo worker must have moved it..