I have just come back to work after corrective surgery expecting at some point to be called in for stage3 with DOM

. I was issued a stage 2 end July 2010, had a period of sickness about Jan 2011 (less than 4 days) and then surgery was end March 2011 and I returned June 2011. A line manager gave me a letter saying; since July 2010 when you were issued with stage1 (it was actually stage2 and shows on absence report as such) you have not met bla bla and I am considering stage 2???? on screen print it shows surgery/other and then APST2? Now, this is obviously a good thing but I'm wondering when i have meeting on Tues, whether it will be noticed or how this has come about?
I'm wondering if because they are so slap-dash/incompetent with rtw's etc that info has not been entered? For 3 times I have not had a rtw(prior to recent return)and the last period of sickness has been entered wrongly (i.e made up, because I did not have an rtw).
Any advise please ?