Some pieces of code had existing line numbers. After adding FailSafe instrumentation with Line Numbers, and then removing it, or after just Removing Instrumentation with Line Numbers, the existing line numbers are removed also.
Removing instrumentation with FailSafe and choosing Remove line numbers will remove all line numbers in functions that are processed. FailSafe cannot determine which ones were original and which it added. To preserve the original line numbers, choose Don't remove line numbers, or use a FSSkip statement to skip that function.