Hello,
I have the same issue noted in several other forum posts (see links below), in that fields display when they should but they are disabled. This happens in the latest version of Gravity Forms 2.6.6, we didn’t have this issue in an older version, 2.5.16.
I have raised a ticket but this has not been resolved. Because this issue is known, does anyone else have experience in resolving this problem?
https://community.gravityforms.com/t/conditional-logic-issue-disabled-fields/808