I've been breaking my head for last 3 hours looking everywhere to see what could cause this issue:
The link with the padding-top issue is:
The one that works properly is:
The CSS is identical into templates. For some reason, I see loading the .messageSimple .comment, .messageSimple .secondaryContent section. I've been working a lot on this site and it really bothers me to see a little inexplicable thing like that happening. Thank you for helping out.