Yeah man, those should be just fine. You should be able to keep them in the fridge for at least a year with no problems. You're probably just used to your dose. Also, I've noticed there is some inconsistency with rips. Some kits are super strong. I'll be used to rips and and seeing great results and then go to a new kit and boom, here come the sides again for a little bit. All rips seems to be great, but some seem to be stronger than others.

A few possibilities. You may have gotten used to the dosage so the sides are less apparent. Or some of your kits were legit and some were not. The former being more likely imo.