In the tax data of the treasury it says that I can deduct 1250 euros and in my company only 1100 euros

I am making the statement of the rent and according to the data obtained from the draft treasury I can deduct 1250 euros from the social security and according to the company data only 1100 euros. Since July 2019, I have been working a reduced day to care for a minor and although the salary is proportional to the hours worked, social security is 100%. Could this be the cause of this difference between the hacienda draft and the company, or is it an error on either side?