Generative Remove resolution issue ( Lr Classic)

You could be tripping over two defects in Generative Remove:

- Its replacement patches are limited to 2048 x 2048 pixels, so if the selected area is larger than that, LR will upscale the patch, producing blurriness and mismatches in noise.  Try selecting shorter sections of the wire that are significantly less than 2048 pixels long. That produces a good result on your lower-resolution screenshot (which is only 1500 pixels wide).

- The new version of Generative Remove introduced in LR 14.5 has a nasty bug, sometimes changing parts of the image far outside the selection. 

Please attach here a full-resolution JPEG exported from the unedited photo, so we can determine the best workaround and, if necessary, provide another example for the bug report.