If you are expecting your measurable progression to always occur in a linear fashion then you are setting yourself up for some potentially upsetting results. While methods of tracking progress such as scales, tape measurements, performance in gym, and overall wellbeing are relied upon for the majority of time, this must be looked upon over more than a day or 2 time span
One or two weird weigh in results don't dictate your current standpoint. One or two poor gym sessions where you couldn't hit your numbers doesn't mean something is wrong. Going off track once in several months doesn't mean you are now back to where you started
We often get so caught up with what happens on a daily basis that we freak out at times. We see a high weigh in result and we can questions ourselves as to whether we done something wrong. We fail on one of our lifts and assume our strength is dropping or something is wrong
These are all elements that we will face in our journey. Providing you are following a process, a calculated one that is, sometimes you need to just trust the protocols you have in place and not overly concern yourself with what a few not so desirable days show on paper. We have many variables to factor in on a daily basis, and your most accurate representation of your progress should be determined over an extended period, more so than a few day span or even a week.