Can anyone tell how the resource hours are getting allocated based on the resource assignment

[sushmachava]

i am new to spm and learning , Can anyone tell how the resource hours are getting allocated based on the resource assignment though their capcity in system is 40 hours why they are allocated like 12, 12,6, 1 like that

For example bharat 2nd resource in screenshot. There resource allocation for june month is 31 hours how that is caluculated, and those are getting divided weekly as 12,12,6, 1 can anyone please explain or guide me on how these are numbers like capacity is getting calculated based on other projects or where i need to refer to understand this