Why is there a gap between the PSNR in paper and the results of official pre-trained model?

The following are the results of official pre-trained model EDSR_Lx4 (https://drive.google.com/drive/folders/1rtJCHuOAEixB1OWmUVbbVm158vzC3kTt)

and the following is reported in EDSR paper

For x4 SR, the model trained on DIV2K. The test results on Set5 and Set14 seem to be very different from those written in the paper, but the results on the DIV2K validation set are similar. Why is this? Are more pixels cropped when computing PSNR on Set5 and Set14?