sterility testing is done on agar on min. 2 different mediums, and as someone who did grow 'shrooms I know that any contamination will be 100% visible on agar after 1 week+I seriously doubt the sterility testing being done right now will show anything either.
but we know it is not sterility issue for sure, because if it is, there will be no stinging during the injection, but there will be injection site reaction later - swelling, redness and itchiness
agree + the most possibly the filler issueI'll bet there's a residual from manufacture that is causing it.
+ ph I saw somewhere someone did already and it was OK
just lets hope the issue is resolved already, I would like to read some reviews about the new batch or the replacement batch