Losing my level up item kit
Usually when I level up from the start of the animation with the yellow particles circling around my avatar, I see (bottom left) the number of objects in my inventory increasing (2079 for example). And at the end of the animation I see the message "level up fielding kit" with the list of objects that I received.
However, it also happens that at the beginning of the level up animation I do not see the number of objects in my inventory change. At the end I see the message of the objects that I have received for a tenth of a second (it disappears by itself after this tenth of a second without even touching the screen).
After that if i open my inventory i recieved nothing, i can restart the game, my inventory is the same than before the level up.