RCDC - Beam Design with ACI 318M-14 - Crack Width Calculation

Dear Bentley team,

I encountered an issue regarding crack width calculation in RCDC with ACI 318M-14 code, described as follows:

Refer to the outputs attached below. The considered beam is B5 and Zone is Top right.

When beam is designed with permissible crack width set as 0.25mm, then actual crack width with 1 layer of bar with 3 no. of 13 dia bars is coming out to be 0.1539mm which is within the limit.

Now for the same design if I restrict the permissible crack width to 0.2mm, then also it should satisfy the design (as 0.1539mm < 0.2mm). But when I reduce the limit to 0.2mm, RCDC is increasing the rebar to 2 no. of layers with 3 no. of 13 dia bars in first layer and 2 no. of 13 dia bars in second layer. 

Changing only the permissible crack width limit should not ideally affect the actual crackwidth calculation. But it is somehow dependent on that and leads to increase in rebar. Please help in rectifying the issue.

Please find attached RCDC file, and two output sheets with maximum crack width set as 0.25mm and 0.2mm for your reference

PDFPDFFMO_P01_01(02.12.2021)-NV-2-Beam-1-0 m.rcdx.7z