Illustrator printing colour rendition issues....

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Let me help you resolve this color rendering issue with your Canon Imagepress C265 prints. Yellow tint when printing documents with opacity/shadows is usually related to color management and transparency flattening settings.
First, confirm that the document is in CMYK and at 300dpi
Make sure that the color profile of the document matches the printer's requirements, from a quick search it seems that it works with the “CMYK: U.S. Web Coated (SWOP) v2” profile.
You can adjust the profile in Edit > Color Settings
Before printing, select all objects with opacity/shadows, go to Object > Flatten Transparency and use these settings:
Preset: High Resolution
Raster/Vector Balance: 100 Vector
Line Art and Text Resolution: 300 PPI
Gradient and Mesh Resolution: 300 PPI

Confirm that none of the colors are outside the Print Gamut, Illustrator demonstrates in the color picker with a “!” next to the color, in the color window or in the color picker. Clicking on the “!”.

In the Print Window, in color management configure
- Printer Profile: Canon Imagepress C265
-Color Management: "Let Illustrator determine colors"
-Grayscale: Dot Gain 20%
- Rendering Intent: Relative Colorimetric

This is to test and identify the correct output of the material. I hope this helps