I'm running into two bugs in Minecraft mobile

Recently, when I was playing Minecraft Mobile, I used a custom touch and chose the third touch method, customizing the keys I was used to, but when I was playing, I found that when I rode on the animal and then down, my custom touch button would become the default I don't understand, this touch and customization have been out for so long, and there is still such a bug. Another bug is that my skin is slim, but when I quit the game and re-enter the game, my skin is changed to Steve's size by default, and I don't understand this bug either, I hope you can fix it quickly