It means what it says - the issue types you are looking at are using different workflows or field configurations from the new ones.
Look at the project configuration screen and drill down into the "field configuration scheme" and "workflow scheme", you will probably find they say something like "for Bug, use field config/workflow A, and for the rest, default to B". Your existing issue type falls into "bug" there, and your new issue types will fall into "default"
Statuspage customers logged more than 194 years of collective incidents in 2018. That’s a whopping 87% increase from the 104 years logged in 2017 , and we aren’t even through December yet....
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