Hi @HSHINDE3, thanks for posting in the Community!
Regarding how the edit happened, here are a few scenarios that could explain this:
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If someone else with edit permissions was working on the document at the same time, you may have seen their live updates happen in real time.
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A license might have been temporarily assigned to you and revoked, or you may have been signed into a different user that had edit privileges.
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Since document editing isn't possible without a license, it’s worth double-checking if this was actually a Lucidspark board instead of Lucidchart, as limited-access users can edit Lucidspark boards up to 5 times a year.
However, if you are certain to have made some changes and cannot undo those, I recommend reaching out to the document owner as they can easily restore a previous version using Lucid's Revision History feature.
I hope this is helpful, please let me know if you have any additional questions!
Cheers