H1B Pay stubs - questions

[h1bdec]

I'm planning for my first H1b stamping at Toronto in Dec/Jan month. I'm working with my current employer from June 2011 on OPT. My H1B started from Oct 2011.

My employer is running my pay checks in Texas from day one onwards even though I'm working in Michigan state.And every pay check ,it is showing total number of hours I worked during that period(Monthly) and per hour amount I got and calculated gross pay& Net Pay.

I paid 2011 Michigan Taxes when I was filed my taxes for year 2011.

If the Visa officer asks below questions ..what is the best way I can answer.

1)Why your Pay stubs are running in different state-TX? If you are working in Michigan?

2) Why your pay stubs amount is so different for every pay check? ( example Aug-Net pay: 5100,Sep - 4700, Oct - 5300 )

I'm very tensed about above questions.Please advise/suggest me best way to answer above questions . Thanks!