Composer - Requested Package [0.0.9] exists as [0.0.5,0.0.6] but these are rejected by your constraint

Question

Today I got a strange error within a composer updatewhich I can't describe myself.

{
   "repositories": {
       "my-plugin": {
           "type": "vcs",
           "url": "[email protected]:mjplug/myplugin.git"
       }
    },
   "require": {
        "my-plugin/myplugin": "0.0.9",
   }    
}

When I try composer update then I'll get

The requested package my-plugin/my-plugin 0.0.9 exists as my-plugin/my-plugin[0.0.6, 0.0.5] but these are rejected by your constraint.

But there exists tags like 0.0.7, 0.0.8, 0.0.9 in the repository. Why aren't they found?

If I set ~0.0.1 as version constraint it works because composer will install 0.0.6.

Any hints? Thank you

EDIT: Here is a Screenshot of our Bitbucket Server Instance: http://imgur.com/a/m8lRT

EDIT 2: SOLVED: In some last release I put the composer.json for some reason to a sub-directory. So this was the problem that composer couldn't find the latest tags.