In my books, I always recommend against opening a project created in an older version of the program with a newer version of the program. Sometimes it leads to strange behavior, and it often corrupts the project file completely.
Versions 11 and 14 are somewhat similar -- but I'd still recommend finishing any project in the program you originally started it in rather than trying to open with version 14. (And hopefully trying to do so didn't corrupt your version 11 project. If so, hopefully, you can open one of the auto backups.)