Change size in video with dynamic link between After Effects and Premiere

I hope someone can help me with the following problem that I consider serious. I make my animated graphic in After Effects and link it to Premiere through Dynamic Link, however when I want to play After the preview with low or medium quality, it transforms the video into Premiere, reducing its size. It should be noted that in the past days I changed my GPU to an Nvidia GTX 970, will this be the problem? I used to have the GTX 960 and it worked fine. I also think there is something wrong with updating After Effects and Premiere CC.