Exaggerated vacuum system steam consumption

Hello, when I use ```reduced pressure distillation```, ```the steam consumption of the vacuum system``` (4.49*E08) is much higher than the steam consumption of the ```reboiler``` of distillation column (4.51*E07), which seems to be somewhat unreasonable, is the steam consumption calculation of the vacuum system not quite correct? Thanks for your help.

The code is as follows.
```
from biosteam import Stream, settings
from biosteam.units import BinaryDistillation
import biosteam as bst
bst.nbtutorial()
settings.set_thermo(['Water', 'Ethanol'])

feed = Stream('feed', Water=1.08e+03, Ethanol=586)
bp = feed.bubble_point_at_P()
feed.T = bp.T
D1 = BinaryDistillation('D1', ins=feed, outs=('distillate', 'bottoms_product'), P=0.01*100000, LHK=('Ethanol', 'Water'),
y_top=0.79, x_bot=0.001, k=1.25, is_divided=True)
D_sys = bst.main_flowsheet.create_system('D_sys')
D_sys.simulate()
# D_sys.diagram('thorough', format='png')
D_sys.save_report('D.xlsx')
```