I have always used BD syringes until this cycle. I bought Thermo brand 23g 5/8''. Preloaded the 10 week cycle. Each has 3cc of STUFF. Towards the end of my cycle, when injecting, some of the STUFF would escape passed the black rubber plunger and back fill into the clear tuube part. I would lose about 1/2 - 1 cc. You could even hear the seal breaking between the plunger and tube. Did the oil sitting in the syringe for 10 weeks break down the rubber plunger?