Pot May very well be Too Compact For Lime Plant

https://direct-wiki.win/index.php/Almost_everything_You_Need_To_Start_out_Your_own_personal_Indoor_Backyard_garden,_As_outlined_by_Industry_experts

My lime plant is steadily shedding its leaves. The new leaves are small and spherical, not like usual lime leaves. Is this because of too much fertiliser?