Exaggerated vacuum system steam consumption

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Hello, when I use reduced pressure distillation, the steam consumption of the vacuum system (4.49E08) is much higher than the steam consumption of the reboiler of distillation column (4.51E07), 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')