I actually see obviously incorrect IMC figures quite often. I did an IPC for a guy that had something like 600 total hours and 300 of "actual". He thought any time you were on an IFR flight plan, you logged that as "actual". (The heading in his logbook might have been different, I don't remember.)
As far as I could determine, it was an honest misunderstanding, probably caused by a former instructor. And I've seen it numerous times, so there is some bad misunderstanding out there (about something I always thought was obvious, not like the "logging PIC/acting PIC" confusion).
If I see an amount of actual IFR that's more than about 10% of their total time, that starts to get suspicious. For my clientele (which is mostly aircraft owners who generally fly for fun) and in my area, it happens, but rarely.