i was wondering if this happens to you too - i notice that my flacid gains in my days off dont stay all day long . Just after shower ( only in my days off ) i notice that my penis loses some gains , but just for two hours, then it comes back to the normal size ( bigger ) . and it keeps bigger ( with the gains it acummulated ) all day long.
This is normal, especially in the beginning. Flaccid gains fluctuate over time, and they generally become more consistent as you advance. It's not a negative PI. If anything, it's probably a positive one.
my PIs analysis 
Linear Mode
