What's your salary when you were fresher and after one year of experience

I'm a 23' graduate joined a small PBC which paid 21.5k per month but they had a hike policy which can make salary jump upto 37k per month after 1 year. Fast forward to now, they announced my revised salary is 29.5k (i aimed no less than 30k) I worked for more than 12 hours a day, completing and closing bug 2x than anyone in my batch whom I attended training with .. even people who were extended in the training got 31k or more than me.

So, is it normal like in IT field where disparity in pay because of different team leads giving different ratings ? I literally lost motivation to work on my given task after hearing my new revised salary , even thinking about resigning.. give some motivation you all

Tech stack (backend dev): just c# , dotnet with some oops concepts.. Nothing else

Work mode: permanent WFH

Edit 1: thanks for all the motivations and the experiences you all have shared .. it was really helpful