Same here in Illustrator CC2019 and Mojave. This has been going on for a while. It's not program breaking, but it is annoying and slows things down while I'm hunting through a jumble of scripts.
An update would be super cool

THIS ISSUE HAS NOT BEEN FIXED!

Updated to Mojave (iMac late 2014) and the script panel is not sorting by name in InDesign CC 2017.
Seems to be ok in CC 2018.

Can you please help as I have many scripts and it's now disrupting my workflow.

Updated to Mojave (iMac late 2014) and the script panel is not sorting by name in InDesign CC 2017.
Seems to be ok in CC 2018.

Can you please help as I have many scripts and it's now disrupting my workflow.

Please open your Creative Cloud app and go to context menu on top right corner. Select check for app update.

This should help you with seeing the latest Id update.

Thanks,
Abhinav Kaushik

My Indesign isn't showing any available updates. I'm at 13.0.1

Scripts no longer in order on my work Mac, which is running High Sierra and APFS. My scripts are in order on my home computer, which is running High Sierra but is not converted to APFS due to it being a Fusion drive.
So I'm in complete agreement that the scripts are being sorted in some different way after converting files system to APFS.

I have also found this bug in my latest update to High Sierra. My home machine and my work machine both have flash drives and are formatted to APFS. I am using CC 2018. OSX and Adobe are the latest releases.

Just verified that on a coworker's mac, she has a Fusion drive which did not get converted to APFS when she upgraded to High Sierra and her Scripts ARE in alphabetical order. So the theory of something different between APFS and HFS+ looks very promising.

I had the same problem and to answer the question about my volume being in APFS, yes, I'm on an APFS on that machine. Also Running High Sierra.

Ah, I see others are experiencing the same frustration. I have many scripts. I have them organized by number to keep them in a particular order. Since upgrading to macOS High Sierra 10.13, my scripts are completely out of order. As far as I can tell, there is no rhyme or reason for the order. Talk about frustration when trying to run scripts in a certain order. And the problem has been going on for several weeks. Why no solution yet?! I've tried several potential ideas to alter the order, but nothing has been successful. Seems we may be out of luck until a fix is brought to bear.

Same problem here. Even the settings for some scripts, if there is one than more file, are not ordered alphabetical in the dropdown from the script dialog. This may is just in combination with High Sierra. But I can not test this right now.

I've run into this same issue. Looking at some of Apple's documentation it appears this issue might be related to changing to APFS and this command in the code "Calling readdir(2) on a directory in APFS returns filenames in hash order, whereas HFS+ returns filenames in lexicographical order." (https://developer.apple.com/library/content/documentation/FileManagement/Conceptual/APFS_Guide/FAQ/FAQ.html)
Is everyone here on hard drives that were converted to APFS? Just a theory, but the more data we give Adobe, the hopefully the more likely they fix the issue. (I'm still on CC 2015, and occasionally CS6 for old files).

I have the same issue in all of my InDesign installations (CS6, CC2015 and CC2018) since upgrading to macOS High Sierra 10.13.