In the workflow list in a project, until 45 workflows, they are properly displayed.
When having more than that in the list, they are displayed as grey lines, hence no information are visible
Not all the workflows are correctly displayed, hence it makes it very complicated to review them easily
This is a bug that has been fixed in 6.5 and that will be part of 6.4.5 under the internal references CQ-4264005 / NPR-28739
A support fix is also available for version 6.4.3