He all... I am wondering if I just ruin my beer in light of the new information I just received. 

I brewed a blue moon clone (AG) and everything went fine on brew day. No issues. Fast forward to two weeks later. I was getting ready to transfer to 2ndary but wanted to get a FG reading before I did. I usually would use my hydrometer, but since I got this new fancy refractometer, I gave that a shot. This is where I ran into trouble. I didn't realize until about 10 minutes ago that using a refractometer for FG it can be dicey since the alcohol can mess with the results. That said, when I did the reading, I was still getting a brix that converted to a FG of like 1.022. I was like WTF... maybe its not done or maybe the yeast needs to be roused. Did that, gave it another day. Same reading...
This is where I am concerned. I decided to add some S-05 yeast to the beer to see it they could pick up where the 1056 leftoff. In hindsight, i realize that FG was probably reached, but I got thrown off by the refractomerter reading.
That said, did I just ruin my beer by pitching yeast into fully fermented beer???

I brewed a blue moon clone (AG) and everything went fine on brew day. No issues. Fast forward to two weeks later. I was getting ready to transfer to 2ndary but wanted to get a FG reading before I did. I usually would use my hydrometer, but since I got this new fancy refractometer, I gave that a shot. This is where I ran into trouble. I didn't realize until about 10 minutes ago that using a refractometer for FG it can be dicey since the alcohol can mess with the results. That said, when I did the reading, I was still getting a brix that converted to a FG of like 1.022. I was like WTF... maybe its not done or maybe the yeast needs to be roused. Did that, gave it another day. Same reading...
This is where I am concerned. I decided to add some S-05 yeast to the beer to see it they could pick up where the 1056 leftoff. In hindsight, i realize that FG was probably reached, but I got thrown off by the refractomerter reading.
That said, did I just ruin my beer by pitching yeast into fully fermented beer???