Manitoba Tuition Fee Income Tax Rebate t1005 - I had never claimed any of this rebate and am eligible for the complete $500 rebate but it's only showing a return of $29

Over $14,000.00 tuition paid prior to graduation, had never claimed any of this rebate. 2016 assessment was 1868 and had advanced tuition fee income tax rebate of $111.00 from 2016. Why is my rebate from t1005 only coming out as $29.00 shouldn't it be $500.00? Thank you in advance.