Today I finally got all the dillithium/borg neural processors together for the MKXII borg set. I go to equip my deflector...... double click it AND NOTHING HAPPENDS. The deflector dissapears, but on my ship it still shows the jem'hadar deflector.
I can't find the borg deflector in my inventory and I can't retrieve it either (so I havent deleted it by accident!)
This is a horrible bug, since I spend A LOT of time getting that set together and now it feels like I wasted a few days. If I do not get that part back, I will quit the game!
Relogged and still not there, send a ticket PLEASE FIX THIS!
I agree, it must have went into your bank or Fleet Bank, or possibly the mail if you were at a mail terminal.
The OP's item is a bind to character on pickup item. It can only be placed in his personal character bank. Can't place it in mail, fleet bank, or account bank.
Double clicking an item will either place it in your bank if it's open, equip it, or use it if it's a consumable that can be used from your inventory such as a fleet credit bonus pool item. In order to discard an item you have to right click it and select the Discard option. Left clicking won't discard it by accident.
It's possible if you have a NPC vendor window open with the Sell tab selected, double clicking would sell the item. Never tried it though. If the OP sold it to a vendor by mistake and logged out, it's gone. Once you log out you can't buy back anything you've sold to a vendor.
Edit: And tsurutafan01 is correct. When you discard an item from your inventory you are always asked if you're sure you want to discard it.