My info from T5008 is included under Dividend, Investment, and Interest as well as Taxable Capital gains. Why? How do I fix this?

Based on the "Type of Income" you listed when you entered the T5008 (Investment/Capital Gain), will determine how it is calculated in your return. 

Go back to the T5008 slip and check your entry just above box 14. 

Here is more on the T5008 if needed:

• T5008 Box by Box Description: https://bit.ly/2TocUvr. 

• From TurboTax how to enter a T5008 https://turbotax.community.intuit.ca/replies/2647749