Hi
I noticed that when the amount of experience to level up is small and get a large amount of experience, after leveling up the experience will disappear and pokemon's current experience after leveling back to zero. that means I've lost the extra.
Please check it out.
Thanks
Here is video
https://drive.google.com/file/d/1cf2IQQyQlwJPrYD1MJN8JTvvnXQq9c4b/view?usp=sharing