Is it normal to gain and lose?

Yes measurements may vary quite a lot. For me it’s in the .25” to 0.5” range.

Have seen my progress from 2012-2014 “disappear” in a sort. Then I realized it’s about measuring too. Then, on the second measurement the very same day, at least length was ok, girth still smaller.

But girth is a beast to measure anyway, because it’s so highly dependent from EQ. In theory, girth results should only be compared when erect at 100%. At least me for myself have to say I’m not sure I alwas did that in the past.