Placed two damaged bows in my small crafting area. Hit shift as I collected the repaired bow and all available inventory spaces filled with copies of the repaired bow. I placed them in a chest, logged off, exited game and reloaded. They were still there.
The bows were un-enchanted and the resulting bows were not fully repaired.
I replicated the error with two more bows in the same manner. (this time to fully repaired bows.)
The image was taken after I closed and refreshed my inventory.
Duplicate of MC-46715 - If you have not, please use the search function in the future, to see if your bug has already been submitted. If you could not find the original report, please comment with the keywords you searched for.