Report An Issue is intended for Reporting Possible Software bugs. Questions on how to work with FileMaker Pro should be posted in the FM Pro Forum Section. (See tab at top of this screen.)
It sounds like your 4th script step is:
Enter Find mode [pause]
Enter Find Mode 
Clear the pause check box for this script step and it will no longer pause.
Note that since you are scanning a bar code, you could scan into a field used as the match field in a relationship that links to the records you are searching. You can then check for the presence of a related record instead of performing find to determine that a record with the scanned bar code already exists.