v1.3.5: slice selection sliders showing incorrect dimension info

See screenshot below. The two sliders in red frame are showing dimension info that seems to have been incorrectly copied from `lev` and/or `ilev`. 

<img width="1424" height="480" alt="Image" src="https://github.com/user-attachments/assets/9c28d799-d77f-4b73-a4e6-78e8e9e9f99b" />