Er... Lesson 17 does list it as Agorel and Agoreg on the website, it has for some time. Is this from the PDF? When in doubt (if there's a difference), always go with the website version. I've done my best to get on top of the PDF, but there's probably still some wee errors that slip through as I'm having to remember everything I've changed and then search through the document to edit it.
My "strange" habit of studying Sindarin is that I love to read/study it on the hard copy so that I can take it anywhere with me, especially when I am working on my computer and am not convenient to switch my browser to your materials, I can steal a minute or two to glance over them on the hard copy instead when I need a tiny break for my brain from work. LOL
More questions on Lesson 17 - Part 3 (Irregular I-stem verbs)
While car- and sav- have "agorel/agoreg" and "awel/aweg" for 2nd person singular followed by "ir" for 2nd person plural, all the others (bal-, dew- and men-) have "ol/og" at the end for 2nd person singular but "elir/egir" for 2nd person plural (just like car- & sav-).
Why are they different?
Aw (He/She/It possessed) - Should I pronounce it as a dipthong or separate vowels?