Yes. A hypothesis is supposed to guide your analysis, not lock you into your first idea. If new evidence contradicts it, updating the hypothesis is exactly what strong problem solving requires.

Make the change explicit: summarize what you learned, explain why it changes the current view, and state the revised hypothesis. That makes the evolution look evidence-driven rather than random.

The mistake is not changing your mind. The mistake is ignoring evidence because you are trying to defend the opening hypothesis. If useful, this guide on how to revise a case hypothesis gives more detail.

Changing hypothesis is fine if you explain why. keeping wrong one just to look consistent is worse.