I can't identify which client I used right now, but I had the same problem with the comment below:

https://identi.ca/cascardo/comment/wYq-hTOfS9C7tHU_sowJpQ

Why is it different replying to a comment instead of the original post? Replying to the comment I want to comment about should be preferred, at least where I come from (e-mail).  :-)

Anyway, I recall I had a similar problem using the desktop client. It was either pumpa or dianara.