This is an unexpected behavior.
Try unregistering IA which is used for this ant build and licensing it again.
Navigate to IA_HOME folder in command prompt
Run build.exe -unregister
Register again by running :
build.exe -ls 127.0.0.1:8888 (license serve ip)
build.exe -registerNodeLocked [path_of_license_file]
If issue persist, raise a support ticket.