Retirement tax questions

so why when I entered the amount of $7500, it has given me a refund of $1237.

 

another question,

I found on schedule C the following:

Self employment deduction to this business:

Total deduction to 1/2 self employment tax is $454

deduction for 1/2 SE tax connected to this business is $454.

 

does that means I am paying the social security tax? What is 1/2. I want to get the full credit of the year which is 4 credit.

 

please explain.

 

Best...

 

Tarek