This is a bit more complicated to explain since it does not happen all the time. Every time I try to screen record this problem, the quote reply feature works perfectly. As soon as I stop recording, it happens again!
Lets say I am replying to multiple quotes in one message. I will begin with highlighting the words and select "Quote Reply", and the quote will appear in the message I am writing. Now I have found 20% of the time, I will highlight text I wish to quote, then once I click the "Quote Reply" button, nothing happens.
I found a temporary solution for when I cannot seem to quote a specific reply.
Keep my screen recording at all time (Joking)
If I click "Quote Reply" on paragraph #1 and it does not work, I will then highlight paragraph #2 and click "Quote Reply" (which works). I will then delete the quote of paragraph #2, and highlight paragraph #1 again and click "Quote Reply" and it works.
As you all know, I am a strong believer in quoting users along with my reply since it avoids lots of confusion, and others reading will be able know what each reply was directed for which question/statement which intern improves productivity on their learning.