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This started happening to me a while back with 8.2 and it happens enough to be disruptive to my development process. Pressing the home key will go to the top of the document sometimes and sometimes it will go to the start of the line (the expected behavior). I have not been able to reproduce it but it seems like it's when there are errors in the source it goes to the head of the document. This means I have to navigate back down to where I was previously editing. It seems like the end key does the same thing except goes to the end of the document.
The behavior described by timothyrheider occurs whenever an error tooltip is open in the editor and the Home or End keys are pressed. It is indeed very disruptive.
Created an issue for this bug in the new Apache NetBeans JIRA: https://issues.apache.org/jira/browse/NETBEANS-403