# Multihead classification training bug

**URL:** <https://discuss.roboflow.com/t/multihead-classification-training-bug/12121>\
**Category:** 🤝  Community Help\
**Created:** [April 23, 2026, 1:01pm UTC](https://discuss.roboflow.com/t/multihead-classification-training-bug/12121 "2026-04-23T13:01:19Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![Cássio\_Sitta](https://yyz1.discourse-cdn.com/flex029/user_avatar/discuss.roboflow.com/c%C3%A1ssio_sitta/32/5717_2.png) [@Cássio\_Sitta](https://discuss.roboflow.com/u/C%C3%A1ssio_Sitta)\
**Post date:** [April 23, 2026, 1:01pm UTC](https://discuss.roboflow.com/t/multihead-classification-training-bug/12121/1 "2026-04-23T13:01:19Z")

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Guys I having trouble training a multihead classification model. The first two times the training went well. I added a couple more images and generated a new dataset. I tried to training 3 times with tree different models, the training concludes but the metrics seems to bee messed up, and the model does not classify new images.  
Thanks in advance guys

 ![image](https://canada1.discourse-cdn.com/flex029/uploads/roboflow1/original/2X/0/0fff88707b3b6a30fe0eebc9af27251dd7897fce.png)

- \*\*Project Universe Link or Workspace/Project ID:\*\*cassio-sitta/maize-insect-demage
- **Do you grant Roboflow Support permission to access your Workspace for troubleshooting? (Yes/No):yes**

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**Author:** ![matbyp](https://avatars.discourse-cdn.com/v4/letter/m/e36b37/32.png) [@matbyp](https://discuss.roboflow.com/u/matbyp)\
**Post date:** [May 10, 2026, 7:52pm UTC](https://discuss.roboflow.com/t/multihead-classification-training-bug/12121/2 "2026-05-10T19:52:05Z")

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same here. happens to ViT model

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**Author:** ![erik\_roboflow](https://yyz1.discourse-cdn.com/flex029/user_avatar/discuss.roboflow.com/erik_roboflow/32/8925_2.png) [@erik\_roboflow](https://discuss.roboflow.com/u/erik_roboflow)\
**Post date:** [May 13, 2026, 2:44pm UTC](https://discuss.roboflow.com/t/multihead-classification-training-bug/12121/3 "2026-05-13T14:44:00Z")

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Hi @matbyp @Cássio_Sitta ,

We apologize for the inconvenience - does this still happen? Failed runs don’t consume credits, so please try training the model again.

Thanks, Erik

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**Author:** ![matbyp](https://avatars.discourse-cdn.com/v4/letter/m/e36b37/32.png) [@matbyp](https://discuss.roboflow.com/u/matbyp)\
**Post date:** [May 19, 2026, 6:18am UTC](https://discuss.roboflow.com/t/multihead-classification-training-bug/12121/4 "2026-05-19T06:18:40Z")

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hello. yes it was recurring situation. i just tried again with same result.

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**Author:** ![system](https://canada1.discourse-cdn.com/flex029/uploads/roboflow1/original/1X/bb6edbfa56d0cf2ee603f061e9e09103502cc8cc.png) [@system](https://discuss.roboflow.com/u/system)\
**Post date:** [June 9, 2026, 6:19am UTC](https://discuss.roboflow.com/t/multihead-classification-training-bug/12121/5 "2026-06-09T06:19:21Z")

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