problem is in copy/paste with trailing whitespace.
Tested on GC849M8 with formula
E14° (D*C+5*B-A*5-E*3*C+2*C-4+F*A)/1000
Yoy can try this:
add white space at end and nothing to see
add second whitespace at end and foormula changes to
E14° (D*C+5*B-A*5-E*3*C+2*C-4+F*A)/1000.
(decimal dot at end) and you see error, and lose variables...