Canon 8468B023 Manual page 159

Printing speed may be slower when you select this check box.
If you are using A4, Letter size, or Legal size paper, change the setting of [Wrinkle Adjustment] in the printer
driver. The improvement effect is weaker for [Mode 1] and stronger for [Mode 2]. Try the adjustment starting with
[Mode 1].
[Finishing] tab [Advanced Settings]
Printing speed becomes slower if you select stronger improvement.
Are you using appropriate paper?
Check the usable paper types, and replace with appropriate paper.
Paper
[Wrinkle Adjustment] Select mode