To confirm are all scripts opening or some of them? You stated "All the scripts (Added in Keyword Test case) opens", your screen shot is only displaying the one you highlighted. Did you click on the script run button, or you right click on single script and selected run?
The default behavior is to not open the script editor when called from another script. Things you can try:
- Close all open script tabs, save workspace, restart TestComplete
- Validate corrupted settings, create new project and try to reproduce. Restore TestComplete default configuration by uninstall, reboot, install
- Remove from the script any OpenFile, save script variable, or similar method
- Remove debug events or error handlers
