cannot remove user lib from on premise environment

we are doing a migration to an on-premise environment, and in the previous version of our app, we had a servelet javax.servlet-3.0.0.jar in our user lib folder, since we upgraded to version 6.9.1 we removed this lib, because it was causing some issues, but the problem that we are facing is  that when we create a new package, and deploy our new version of the app (without the lib) to the server, this lib get recreated even if we are sure it is not included in our deployment package.
1 answers

Did you check the deployment package itself, by setting the extension to zip and viewing the content? From where did you remove the lib, be sure to remove it from the userlib dir that is not placed under the deployment dir.