Objects are moving when file saved in a lower/old version of Illustrator

Hi there,

Sorry to hear about this trouble. As @Mylenium said, there are chances that the tools and features used in the document are introduced in a recent version of Illustrator and cannot be retained in an older version. So, I would request you to share a few more details like:

• OS and current installed Version of Illustrator
• In which version you are saving your file and which objects are moving from their position.
• Share a small video or screenshot of your workflow, including the tool & features used.
• Is the issue related to a specific document? If yes, could you please share the document with us? You can upload it to the Creative Cloud (https://helpx.adobe.com/in/creative-cloud/help/share.html) and share the download link.
• Does resetting Illustrator Preferences ( https://helpx.adobe.com/illustrator/using/setting-preferences.html) help to resolve the issue?
  Disclaimer: Please note that resetting preferences will remove all the custom settings, and Illustrator will launch with default settings. You can also take a backup of the folders in case you want to. Location is mentioned in the article.

We are here to help. We just need more information.

Impossible to know without any info about what specific features you used, what versions you are saving to and so on. Screenshots would help a lot, too. Chances are that you simply used a feature that was only introduced in a recent version of AI and cannot be retained in an older version. You may need to expand or flatten such stuff before saving to a legacy format.

Mylenium