Expression changing values

Grasshopper
1

I am concatenating data into Gcode commands, based on an example I found.
I need to create strings with the values from a series of sources, in this case: X Y Z, and E. The values for x y and z are inserted in the string correctly but E comes out messed up, although before going into the expression it looks fine.
Any ideas?

Thanks

Screen Shot 2021-11-25 at 21.25.32
Screen Shot 2021-11-25 at 21.25.321089×917 95.9 KB

Untitled.gh (17.0 KB)

2

I just found out that changing the “E” for Z or A, for example, works! Is E a reserved letter for some reason?

3

Of course it is Eulers number… For future desperate people, just use ‘E’ and you’ll be fine