No, that's the misconception. Your salary is always based on the IPS level you are on and the annual salary package. If you look at it from a annual perspective, a 4k salary should come up to:

12 months: 48k
13th month: 4k
performance bonus (about 1.5mth for a newbie C grade): 6k
govt bonus mid year+ end year(based on 2022): 5.6k

So total you are looking at around 63k.

A 6k salary is IPS 7.