When a comment gets removed from a post, the comment is hidden so that people in the thread can’t see it but the comment count stays the same. Comments are often removed by community moderators or AutoMod for breaking community rules or by Reddit’s spam filter, so it’s not uncommon for the comment count to be higher than the actual number of comments in a thread.
If you have more questions that aren’t covered in these FAQs, check out r/help. Someone may have had the same question, or you can ask a new one and a Reddit administrator or one of your fellow redditors will help you out.