within table does not copy values from multi-column values to some colums

### Bug
Using the sample PDF, some columns have not their values copied in, namely `Self-consumption - load on` and `Self-consumption - load off`
...

### Steps to reproduce
`docling "Datasheet-SmartSolar-charge-controller-MPPT-75-10,-75-15,-100-15,-100-20_48V-EN.pdf"`

`docling --image-export-mode referenced --table-mode accurate "Datasheet-SmartSolar-charge-controller-MPPT-75-10,-75-15,-100-15,-100-20_48V-EN.pdf"`
...

### Docling version
```
$ docling --version
Docling version: 2.43.0
Docling Core version: 2.44.1
Docling IBM Models version: 3.9.0
Docling Parse version: 4.1.0
Python: cpython-313 (3.13.5)
```
...

### Python version
Python 3.13.5
...

[Datasheet-SmartSolar-charge-controller-MPPT-75-10,-75-15,-100-15,-100-20_48V-EN.pdf](https://github.com/user-attachments/files/21663331/Datasheet-SmartSolar-charge-controller-MPPT-75-10.-75-15.-100-15.-100-20_48V-EN.pdf)

[Datasheet-SmartSolar-charge-controller-MPPT-75-10,-75-15,-100-15,-100-20_48V-EN.md](https://github.com/user-attachments/files/21663430/Datasheet-SmartSolar-charge-controller-MPPT-75-10.-75-15.-100-15.-100-20_48V-EN.md)