STC version 4.20 and 4.22
First, the good news is this issue has been fixed in 4.24. The reason for the problem is STC could not do auto-detect on some CFP interfaces in 4.20/4.22. You have to manually set the CFP interface type. To do this, click on the 40G port, and then go to the tab "40/100 gig Advanced". On the portion "de-emphasis and main tap swing", select manual mode and select correct CFP type.