No detection on "training image" with a trained net

[cwr8401]

Hi,

I trained ZF net faster rcnn, I used custom data with three classes.
I got about 70 mAP with the above dataset.
But, the trained net returns almost no detection from the images used in "TRAINING"
I mean I really test "TRAINING IMAGES" I suppose it should give some results, but it doesn't.

Could anyone give me pieces of advice what I am possibly missing?

I would appreciate any helps.

Thank you!