Why do you think someone recently moved my old questions to the wrong categories?I am a level 4 user, and I cannot move them back.?

Why have they moved your old questions to wrong categories, possibly because they can, possibly because they don't like you, who's to say what other people are thinking on the internet unless they come out and say so.

As for not moving them back, you can move your own questions at any level. Click the Edit button on one of your questions and choose the Edit Category option. You may have to switch to desktop mode if you are on a mobile device though.

Everyone can move their own questions,you must not be very observant.Only level 7s can move other users questions.

Every level can move them back. :)

You can move them back to the Correct Category you just cant move other people's Questions around

Go to your Question click on Edit Category under the Blue Edit menu then Select the Correct Category for it and click Submit

There are a bunch of mentally ill level 7s who think they are the Yahoo Answers Police and are constantly moving questions to the wrong category. There are constant complaints about this yet Yahoo does nothing to address the issue.

In certain categories, like politics, people move questions out of spite.

But you should be able to move questions back to the proper category.