Stela,
I just tried pattern #115 on minimal and very stretchy without error. I'm guessing the problem is your measurements. Could you run a test for me, please? In your account on the Measurement Sets tab, select the Test button next to the measurements you are using. Then select the 'test basic measurements with bodice' option from the menu. Run through the draft and see what happens.
The patterns need to draft for pregnant people, so I'm very curious of your results. Please post back here what you find. Also, if you can give me your reference number (far left of measurement set on list) I can also look into it with your permission. (I won't access someone's measurements without permission.)
Also, I should mention that very stretchy will make a smaller garment than minimal stretch. I'm not sure that's really what you want as you said you were going for looser. The knit stretch sizes a garment down by making it tighter to accommodate fabrics with greater give.
Thanks for bringing this to my attention.