When using an advanced LMS integration, WebAssign assignment scores greater than 100% or less than 0% are synced to Canvas™ as 100% or 0%, respectively.
Note This limitation does not apply to courses using the new integration type.
The Learning Tools Interoperability (LTI) specification requires this behavior.
If this happens, consider changing how your WebAssign assignments are scored to circumvent the limitation. You might also award bonus/extra credit points separately in Canvas.