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If you type [tag:jenkins] it comes out as a nice button which links to that tag on the main site. In comments, it just looks like a normal link: jenkins.
The fix is to (a) remove the stack from the URL, and (b) reupload through SE, as those links are permanent, while the personal ones may eventually expire.
@Hashim. In the dim and distant past, when you uploaded an image through SE, it went to i.imgur.com. And if you uploaded an image to Imgur yourself, and then linked it here, it also went to i.imgur.com. Then SE changed things so that their uploads went to i.stack.imgur.com, and also ran a batch edit on their sites rewriting all links to i.imgur.com to i.stack.imgur.com. This broke links to images which people had uploaded themselves.
Don't worry about downvotes on this question: downvotes (and upvotes) on meta sites have no effect on reputation. If the downvotes came in before this question was migrated to meta, that will affect your reputation, but only temporarily: you'll get that rep back as part of an automatic cleanup script which runs occasionally (daily or weekly, I think).
