I was just writing a chart and looked at this.
Now, when selecting a group of chords you can transpose all of them together consistently. The interval to which you can transpose them is somehow constrained by conditions I could not decipher, the highest and lowest roots, possibly the number of chords selected. Spent a half hour on it, so I’m moving on.
It is consistent, all selected chords are transposed correctly.
So I guess this is fixed.