If you create a post using 5 tags, users will not be able to see the post when they browse the 4 secondary tags. It will only show up in the new/hot/trending category of the main tag. If you create it using 4 tags though, then it will show up when users browse the primary tag as well as the 3 secondary tags.
Example 1 (OK):
- Tags: glitch steem steemit news
- Users will see the post when browsing the glitch, steem, steemit, and news tags.
Example 2 (Not OK):
- Tags: glitch steem steemit news issue
- Users will only see the post when browsing the glitch tag.
- Users will not see the post when browsing the steem, steemit, news, and issue tags
This was reported by in this post. There is an error with the Steem blockchain API which is causing it.
Here is the GitHub issue to track the issue/fix:
https://github.com/steemit/steem/issues/673