Incorrect request creation

Incorrect request creation

Hi!
We ran into this issue a month ago. The author created an request by mail, but this request was registered on the ME with a description of the letter from another request. 
Subject name is correct.
Discription - from another request.
How could this happen?
We have been trying to figure out this problem for a long time. Everything worked fine on the mail server side (mail content is correct),  but the request was generated with a description from another request. Maybe there are SQL tables to keep track of emails?

We are using version 11.1 Build 11136, but, unfortunately, we can't provide logs (a lot of time has passed since then). Just wondering. Maybe someone had similar cases?

Thanks!
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