i assume in Config -> General config the I/J Mode is set to absolute.

so your starting coordinate in X is 44,375

by using

G2 I-44,375

you are telling the System, that the Center X coordinate of your circle is absulute -44,375

so your start is at +44,375 and the Center is at -44,375 makes a radius of 88,75 and a

diamater of 177,5. exactly what your ruler Shows.

about the Min/Max:

Max X := X-Start = 44,375

Min X:= X-Start - Diameter = 44.775 - 177,5 = -133,125

Y is nowhere specified, so it takes the startvalue = 0

Max Y := 0 + Radius = +88,75

Min Y := 0 - Radius = -88,75

so the entire Problem is the Absolute I/J Mode insteed of incremental.

with incremental Mode we will have the following situation

so your starting coordinate in X is 44,375

by using

G2 I-44,375

you are telling the System, that the Center X coordinate of your circle is incremental -44,375 witch

makes the Center going to absolute X = 0

so your start is at +44,375 and the Center is at 0 makes a radius of 44,375 and a

diamater of 88,75.

about the Min/Max:

Max X := 44,375

Min X:= -44.375

Y is nowhere specified, so it takes the startvalue = 0

Max Y := 0 + Radius = +44,375

Min Y := 0 - Radius = -44,375