Aproblem exists when the current condition differs from a desired condition. this idea defines which step in problem-solving?

If the Problem is understood in the right way then it should be identified during the Analysis phase.

Sometimes when we start solving the as we proceed we land up in the solution which is not suitable for the given solution and it has deviated.

This is something related to the class lectures where the lecturer starts at one place and land up somewhere as the children touch upon question related to the topic and deviates out.

So all these aspects should be captured in the analysis phase.