The belief is you referring to FDMEE as you did not state the module (FDM or FDMEE or Cloud Data Management ) or the version of the Software you are on.(e.g FDMEE 126.96.36.199.210 )
In FDMEE Open batch process has always created created a folder by process ID under the batch folder , the software is working as designed.
Do let us know what is the Archive Mode value set for Profile Type "File" in System Settings.
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Did Your Question Get Answered in My Oracle Support Community (Doc ID 1180503.1)