Here is my question i am having trouble injecting my prop. Here is the problem i have 1 1/2 cc and 1 cc of b12 mixed into each pin. And when i am injecting there is about 1/4cc left in the pin and know matter know hard i push on the pin i can not get it to go in. They were glute shots and last week they were delt shots same thing. Anybody else experince this?