almost 70% of the itens in my bag disappeared when I went to the dark realm in the darkrai halloween event

[Kodomaru]

When I went to the dark realm in this year (2019) halloween event, a lot of my itens in the bag just weren't there anymore, i though it was something with the quest, so I don't gave any attention to this, but when I finished the quest, and went to necropolis town, my bag stayed the same as in the quest. I lost almost 10 rare candies, a lot of berries, fighting itens like life orb and leftovers, hope someone can help me with this! Thanks for the time reading this, have a good day XD