Making continues walls.

Wall thickness .10

No.1 – Enter 2.040 and is correct 1.940
No.2 – Enter .800 is correct at .700
No.3 – Enter .410 is wrong should be .310
No.4 – Enter 1.630 is wrong should be 1.530 ( after enter No.3 the wall turns up I have to turn down or
enter angle 0 degrees).
No.5 – Enter .845 is wrong should be .745
No.6 – Enter .700 is wrong should be .610

what am i doing wrong?