My income summary shows an amount for "other income" but I did not enter anything in this category. Is it drawing data from somewhere else?

Line 130 - Other income contains taxable income not included in other categories. Common sources of other income include scholarships/bursaries, retiring allowances, lump-sum payments, death benefits, and payments from a Registered Education Savings Plan (RESP).

This  CRA website has more information on Line 130 - Other income  : https://www.canada.ca/en/revenue-agency/services/tax/individuals/topics/about-your-tax-return/tax-return/completing-a-tax-return/personal-income/line-130-other-income.html

Thanks, but that doesn't explain it. All such income would be entered under "Other Income Sources," and I don't have anything entered there.

Does "Other Income" in the Income Summary draw amounts from T slips?

Yes.

Some types of other income are shown on the following slips:

• T4A slip, Statement of Pension, Retirement, Annuity, and Other Income
• T4RIF slip, Statement of Income From a Registered Retirement Income Fund
• T3 slip, Statement of Trust Income Allocations and Designations