Negative numbers appeared when I was training with 3dmatch dataset, is this normal?

[joker-lb7]

details as following:：
Epoch: 3 [10400/33532] data_time: 0.03s model_time: 0.10s
ref_loss: 0.000000
ref_error: 0.000000
desc_loss: 0.000000
desc_acc: 52.416992
eqv_loss: 0.000000
eqv_acc: 0.000000
det_loss: -94.586985
match_loss: 0.000000

[wzp21142]

Encountered a similar situation on our private dataset, where after several rounds in the Keypt stage, the negative det_loss has fallen to tens of thousands.
BTW, the detector loss is defined in the D3Feat paper and it's designed to allow for the negative values, but i'm not sure if the value (tens of thousands) is as expected.