Is the minified code different to the source?

It seems the code in the minified version of dhtmlxscheduler.js is different than the one in codebase/sources. When I include the source version, there are problems with my calendar in month view. But when I include the minified version, there are no problems.

there shouldn’t be any differences, the minified version is automatically built from the source one during the build of package.
Can you please provide a demo?