Why do I burp sometimes?
Solution 1:
The second food consumption is caused by the bug MC-849. Under certain circumstances, it's possible to accidentally eat a second food item, without seeing it, slowing down your movement or a chewing sound.
The burping sound still plays, since it's caused by the server telling the client that eating is finished. It also plays after the first food item, but it's hard to hear due to the eating sound.