Deductions are taken from overall income – your share is calculated by the formula (income-payouts-deductions) x percentage which in your case looks like net 30%.
Deductions include bonuses and progressive contributions. The only way to find out what accounts for what is to ask the player or the casino for a full description of activity. You might be able to make a guess with the bare numbers they provide but better to have all the details.
In case anyone is concerned that the deductions look high, or not fair… they’ve always looked okay to me. I just looked at all my players and the great bulk of deductions came from two players at different casinos who are clearly progressive players – and who always donate the most to my bottom line.