Experience orbs randomly give way too much XP

The mods have noticed that every now and then an xp orb will give up to a ½ or a ⅓ of a high level (>20th level) of experience. For example, xp when catching a fish has been observed to give almost ½ of the xp from level 27 to level 28, or 24 to 25. Currently no idea how to reproduce this consistently.

Confirmed on several Android and iOS systems.