Check the shared drive @ your project 
If I recall correctly, this issue was first discovered a couple of years ago and we had a call logged at SAP. Since no one could "replicate" the issue (as no one really had a clue in which cases the system behaved wrongly), the call was finally closed by SAP (in 2013 I think).
PS the events are not the root cause... those are just indicating how the records were created (you can see that in transaction LBWE)