a) Please wear the earbuds correctly, earbuds are marked with "R", "L". "R" stands for right, "L" stands for left.
b) You can try to slightly adjust the wearing angle of the earbuds or the depth of insertion into the ear canal to improve it, so as to ensure that the earbuds fit the ear canal.
c) Choose the suitable ear cap, S/M/L, you can choose different size for the right and left ears.