After splitting an Expense claim, if the figures now do not equal the total figures of the claim that was split, then you will need to reset the line on the Credit Card import screen. You will lose any splitting you have currently done on the line already, however this will need to be done to resolve the issue.
Click Settings
Click Credit Card Imports
Expand the Credit Card Header that has the incorrectly split claim
Click Reset lines
Tick the line with the issue
Click Reset selected , then confirm this.
Now you can go back to the Credit Card, and it should split again.