NVIDIA-NeMo / NVIDIA-NeMo/RL

[BUG] GRPO Nemotron HelpSteer3 recipe has very high logprob error

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bug
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Description

**Describe the bug**

When running the nemotron-helpsteer3 GRPO recipe (examples/configs/recipes/llm/grpo-helpsteer3-llama-3.3-nemotron-super-49b-v1.5-4n8g-fsdp2tp8.yaml) with the HelpSteer3 dataset, the log_prob_error is extremely high both before and after PR [#1506](https://github.com/NVIDIA-NeMo/RL/pull/1506).

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