I encountered a very specific bug when learning blueprints. I have a faulty mouse that sometimes clicks when you release the button and double clicks when you click once. Anyway, when I have two blueprints one next to the other and I click to learn one my mouse does an extremely fast double click, the other blueprint gets bumped up and is clicked on as well and I only learn one of the blueprints while the other just disappears. It's important to note that I couldn't replicate this bug intentionally by clicking as fast as I can but I did encounter it several times.
