Is this chart normal?

Are you tracking orally? Whether you’ve been sleeping with your mouth open, talked or did anything before taking the temperature, not had 3 hours consecutive sleep can all affect your temperature. I did mine vaginally made it a lot easier to understand and then the odd spike I could usually put down to a bad nights sleep etc x

So much can influence BBT like Faith said. But it can also mean hormonal imbalance. But to confirm that you’d need to see BBT chart from more cycles.