Just to reiterate what @zwack said, for your piece of mind.
What you are experiencing is completely normal.
When you first get your install, your body may be experiencing some shock, there can be very little fluid build up, meaning you can read and write to your chip easily.
Then after [period of time] you will get swelling/ inflammation/ fluid build up or @zwacks " corporeal response to a traumatic event 
" and as he says above, even if you can’t see it or feel it, it will be there and causing the issues that you are seeing.
Just forget that you have it and let it heal for a full 2 weeks.
After that, you should be golden 
UPDATE:
and as I was typing, Amal has jumped in