Should I be paying $8000 tax on $35,000 income? seems very high (22% of all income) I would have expected about $3000 (15% over 13K- tax free threshold av)

That is too high, even including provincial tax.

so if all the amounts im inputting are correct.. what could it be.? I'm self employed, as soon as i type in the income it say $8000 tax due! with my deductions it comes down to $6000.. i have tried 2 times, same results!!

If you live in Ontario, your tax payable on a total $35000 taxable income (line 260j would be around $7000 before credits. This is federal plus provincial al. You also have Ontario health premium.
Take away your Personal credit and you would owe around $6000,
Check your entries and make sure you are using an updated software version.

I live in BC. We pay MSP separately. My partner earned about $6,000 less than me however paid $4000 less in tax.. So i somehow lost 2/3rd of the extra money i made? I will go back and double check everything though! thanks for your help 🙂

Some of the forms may not be finalized yet. Wait until Feb 18th and do and sign back in please. (CAA on self-employment being one of them)  Also, as a self-employed individual, you are required to pay both the employer's and employee's portion of CPP.