Very beautiful orange color. I like these very much. Something I always look for but never find at any of the shows on the donation table. (I wonder why?)
C. deckeri is now considered a variety of C. skinneri. Some C. deckeri are said to be self pollinating and I have reserved a flask of seedlings from a parent that self pollinated. https://lab.troymeyers.com/flasking/...lask&id=TN7221
There are some pupulations of Guarianthe (Cattleya) aurantiaca in nature that are self polinated. You can't do anything to solve it. This is a genetic issue, not a culture problem.
You'll have to purchase a new G. aurantiaca that opens flowers fully.