hi guys, so i've been doing gym for almost 5 times per week, and i do cardio most of the times. almost 1hour + on cardio and half an hour on weight (to tone my arms). During the past 3 months of regular gym session, i definitely LOOK slimmer, and also can fit into more smaller sized clothes, and i can feel harder muscles on my body. however the number on scale does not show big difference. i only dropped 4+ kg for 3 months. most of the time i eat very very light dinner (sometimes just oat or just chicken breast)

am i doing things wrong? when only i will experience numbers dropping? at least 1 kg per week. feel so demotivated really.