DB48X: HP48-like RPL implementation for DM42

[spiff72]

I am trying to figure out if this is a bug, or operator error...

If I have a program stored in a variable, and recall it to the stack, I find that the editor is acting strangely. As a simple example, take the following program for converting a number on the stack from mm to in:
<< 25.4 * >>

I wanted to include actual units in this, so I attempted to edit it by recalling it to the stack, pressing the right arrow button to enter edit mode, and then placed the cursor after the first <<. If I try to enter a 1 and then append units of mm to this by using the 1st shift UNIT menu and picking length, next page, mm ... instead of appending the _mm to the 1 I just entered, the cursor jumps to the end of the 25.4 and appends it there instead. I tried this in the sim initially, and then on my hardware DM42, and the same thing happens.

If I enter the program from scratch at the command line, I am able to enter the program as I intended.

I'm assuming that this could be done with some of the units functions, but my end program looked like this:
<< 1_mm * 25.4_mm/in / >>

Why does the cursor jump to the 25.4 in this scenario?