Question about transfering to COCO with Mocov1 and Mocov2 checkpoint

[mZhenz]

Hi, I get some question when I reproduce the results on COCO.

When I use the Mocov1 pretraining checkpoint released in the repo, I can get the same results reported in the paper as below.
Evaluation results for bbox:

AP	AP50	AP75	APs	APm	APl
38.658	58.372	41.765	21.351	43.372	51.629

Evaluation results for segm:

AP	AP50	AP75	APs	APm	APl
34.014	55.207	36.171	14.915	37.526	50.783

However, when I change the pretraining checkpoint to the Mocov2 one. I get a worse results as below.
Evaluation results for bbox:

AP	AP50	AP75	APs	APm	APl
33.921	52.401	36.497	19.247	37.598	45.513

Evaluation results for segm:

AP	AP50	AP75	APs	APm	APl
30.113	49.341	31.897	13.713	32.557	45.618

There is a large gap about 4% between the results of Mocov1 and Mocov2. The code I used is in this repo with official setting. Is this a normal phenomenon? Or just I make some mistakes? I am wondering if anyone could kindly give me some advices or explanations. Thanks a lot!