Could be a water retention issue if you are sensitive to specific ingredients in those packets. Are there any commonalities between them? Soy? Whey protein? Milk protein?
Having done IP in the past, you may find that your body understands ketosis, recognises the pattern that you're putting it back into and loses more slowly as a result of having a history to the volume of ketones needed to keep your body functioning without over producing them.
W1=10.0; W2=4.2; W3=2.4; W4=3.4; W5=4.2; W6=4.6; W7=1.2; W8=4.0; W9=3.6; W10=2.4; W11=3.8; W12=3.2; W13=1.8; W14=3.0; W15=3.2; W16=1.0; W17=4.8; W18=1.4; W19=5.2; W20=1.0; W21=2.0; W22=+0.6; W23=5.0; W24=4.6; W25=2.8; W26=1.8; W27=+2.2; W28=0; W29=3.4; W30=2.2; W31=0.4; W32=2.0; W33=2.7; W34=1.3; W35=1.4; W36=1.2; W37=3.4; W38=