Steps are not sequential strange behaviour

I am running PPO , with CUDA on a GPU I saw that the steps are not in the sequential order

Is this because of parallel processing or something is wrong.
I have seen that many steps are repeating in different order ? can anyone help me .Thank you

Could you post (pseudo) code which shows how these operations are applied?

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Hi sorry I forgot to close this issue it was an error with notebook I was using it was printing everything twice.Thank you for your response.