You've used the activity id `http://id.tincanapi.com/activity/tags/tincan`` to refer to multiple tags. This is telling the LRS that there is in fact one tag and you're giving it conflicting information about the name and description of that one tag. Instead, use a different activity id for each tag.
For example: https://twitter.com/hashtag/xAPI and https://twitter.com/hashtag/TinCanAPI
You've used the activity id `http://id.tincanapi.com/activity/tags/tincan`` to refer to multiple tags. This is telling the LRS that there is in fact one tag and you're giving it conflicting information about the name and description of that one tag. Instead, use a different activity id for each tag.
For example:
https://twitter.com/hashtag/xAPIandhttps://twitter.com/hashtag/TinCanAPI