Unable to select "wipe data/factory reset" in recovery mode
I know this answer may be of low quality, having no concrete explanation and all; but sometimes recoveries behave pretty weirdly. Once with my old device, I tried to make a Nandroid backup, and it completed within a few seconds. Seeing that the backup was basically empty, I ran it again, and this time I can't select the nandroid option.

You can try what I did - just select the option with your volume keys as though it's there. Just guide yourself with the highlight.