Question about the POR attack

[AISTUDYML]

您好，我按照您所提供的参数设置，跑了POR的攻击方法，但是ASR的值非常低
+================================+
| Summary |
+================================+
| poison_dataset: | lingspam |
| poisoner: | por |
| poison_rate: | 1 |
| label_consistency: | no |
| label_dirty: | no |
| target_label: | 1 |
| CACC: | 0.99483 |
| ASR: | 0.0062112 |
| ΔPPL: | nan |
| ΔGE: | nan |
| USE: | nan |
+================================+

这是为什么呀？
期待各位大佬回复，谢谢！