Board Thread:Help Board/@comment-121.54.58.241-20151006120020/@comment-108.226.87.12-20151009190228

I would say the only real solution here is that you may have added your metal mimic to your Favorite section. To know that a unit has been added to you Favorites, a star should be appear to the top right corner of your metal mimic pic/icon in the "View Unit" tab. By adding units to your Favorite, the unit will no appear in the "Sell Unit" tab nor will they be available as a fusion unit as well! Since your description fits this PERFECTLY, I'm 100% sure that there is no bug and just a little misunderstanding. Goodluck.