Zwave dimmer shows up as light

I have several dimmers and switches.

All but one of the dimmers shows up in my ‘overview’ as a dimmer. One shows up as a toggle switch.

For the dimmers, the ‘Hold Action’ shows up as ‘Default Behavior’.
For the one that shows up as a toggle, the choice is only ‘Default Behavior (toggle)’.

I resolved this by deleting the entry, copying an existing dimmer, pasting and changing the entity.

Why did this not show up as a dimmer automatically, like the others. What am I missing?