They usually go into your inventory then you need to equip them to use them (for large shield charge this would be on any bridge officer or your own) in the 4 ground equipment slots. Anytime I've crafted it goes straight to inventory but they're no different than the dropped charges you get so you might not have noticed the difference? Just a thought on that. It's been a while since I've done crafting as I've gotten most of my stuff via drop or quest rewards. I need to spend a weekend sometime and rack up my skill again. LOL
You can ignore what it says in the chat log, as they have some weird ways of describing what you just did, this is one of them as you didn't "sell" it. Most crafted items will appear in your inventory, but ground equipment like the shield charge might also appear in an empty equipment slot on your character.