Haven't noticed anything like that in my own vials. Been using GHK every day for five or six months. Which bac water are you using? I've tried a couple brands myself.
After six days my 100mg GHK-Cu started showing something at the bottom of the vial. I've noticed others reporting the same thing where it looks fine right after mixing but then clumps up around day six or seven. This happened across vials from various sources and batches. Adding extra bac water and putting it back in the fridge stopped any further changes. What could be causing this after about a week?