Here is the Help text:

Bend Length Attachment Percent
Whenever the element leaving the tangent intersection of a bend is within (n)% of the bend radius on either side of the weldline, CAESAR II inserts an element from the bend weldline to the "TO" node of the element leaving the bend. The inserted element has a length equal to exactly (n)% of the bend radius. The user may adjust this percentage to reduce the error due to the inserted element, however, the length tolerance for elements leaving the bend will also be reduced. To obtain more accurate results the user must include less "slop" in the system dimensions around bends. The default attachment is 1.0 percent.

The "inserted element" is placed at the end of the bend. Although you do not "see" it there is a straight run added to the end of your bend. Your second job had a long run added.

I have had no reason to adjust this program setting.

MEC-21 is a program, one of the first for pipe stress analysis, developed by the US Navy for piping. (Quoting the Preface of the MEC-21/7094 User Guide) "MEC-21 was written in 1959 in the PRINT language for the IBM-705 and is an expanded and modified version of MEC-5 written in 1958. It was revised and improved in 1960 to reflect application experiences and solve more complex problems encountered in nuclear submarine piping. ... MEC-21 ... was conceived and written by John A. Olson and Robert V. Cramer of the Mare Island Naval Shipyard Engineering Computer Application Branch, Code 246, under the supervision of David. B. Mitchell and Stanley R. Williamson."