mean teacher's ap is lower than paper

[KaoJZhu]

mean teacher result ,which test on validation set and train on small unlabel set.
|AP@50 |overall |0-30m |30-50m |50m-inf |
|Vehicle |73.31 |84.82 |68.15 |52.92 |
|Pedestrian |31.88 |36.56 |27.27 |18.93 |
|Cyclist |61.41 |73.01 |54.92 |37.50 |
|mAP |55.53 |64.80 |50.12 |36.45 |

the ap is lower than the paper, especially the distance is 0-30m

[KaoJZhu]

baseline
|AP@50 |overall |0-30m |30-50m |50m-inf |
|Car |73.10 |83.01 |67.48 |52.16 |
|Bus |72.18 |83.42 |75.62 |46.33 |
|Truck |38.51 |58.01 |37.03 |17.79 |
|Pedestrian |28.38 |31.61 |25.40 |17.15 |
|Cyclist |58.21 |70.30 |52.39 |34.30 |
|mAP |54.07 |65.27 |51.59 |33.54 |

mean teacher
|AP@50 |overall |0-30m |30-50m |50m-inf |
|Car |75.00 |85.13 |68.35 |55.60 |
|Bus |72.09 |83.46 |74.90 |45.53 |
|Truck |34.03 |50.46 |31.72 |14.38 |
|Pedestrian |31.88 |36.56 |27.27 |18.93 |
|Cyclist |61.41 |73.01 |54.92 |37.50 |
|mAP |54.88 |65.72 |51.43 |34.39 |
The ap of the truck decrease 8 points. Did you meet this result?