num_bands
“Most of these models are BS[band-split]/Mel-Band Roformer. [It] can be distinguished by their config, bs uses `freqs_per_bands`, Mel-band uses `num_bands`”
So you most likely installed this model with wrong model type chosen during installation of the model. Go to Edit model config and set it to Mel-Roformer instead of BS-Roformer (or the opposite) and the non-V2 one.