Instagram appears to be testing a new limit that restricts users to only three hashtags per post. Some users now see a notice blocking additional hashtags, though Instagram hasn’t officially announced the change.
It’s unclear whether this is a full rollout or just a limited experiment, but it could signal a move to reduce hashtag spam and reshape how posts are discovered. For now, the old days of adding dozens of hashtags may be coming to an end.
Source: GSMArena