Gymrat gave you the real answer.
It’s the fact you are using Sustanon, which contains propionate and phenylpropionate, both of which give guys pip, from slightly sore to crippling (me).
Just Buy Cyp from an UGL in the future. It will be the same as you’re used to, with the exception of the carrier most likely. If you start having issues THEN you’ll know it’s the GSO your body doesn’t like.