allocation values in chargeback not rounding correctly

Hi,

We're currently using the chargeback module and I recently noticed that it seems to do some really weird rounding of numbers when it sums up allocated resources.

Example:

I've got a group of VM's with a total of resources as following:

measured over 1 day, 30th of april

With the custom view setting "Do not sum daily allocation values" ticked

CPU: 10 vCPU

Memory: 21.5 GB

Storage 432 GB

Custom view setting "Do not sum daily allocation values" NOT ticked

CPU: 9 vCPU

Memory: 21 GB

Storage: 424 GB

Measured over 30 days, 1st - 30th of april

With the custom view setting "Do not sum daily allocation values" ticked

CPU: 10 vCPU

Memory: 21.5 GB

Storage 432 GB

Custom view setting "Do not sum daily allocation values" NOT ticked

CPU: 270 vCPU (should be 10 * 30 = 300)

Memory: 630 GB (should be 21.5 * 30 = 645)

Storage: 12.4 TB (should be 432 * 30 = 12960gb, 12,96 TB)

Summary:

Either I'm really useless at math and am not understanding something OR there's clearly a big rounding error in chargeback and how it calculates allocation.