I'm a visa requiring third country national and I have a 1 year multiple entry schengen visa (maximum 90 days). I went to Iceland on the day the visa became valid, and came 2 weeks later. At the exit border control, the agent there informed me that they had placed a wrong seal at entry by mistake (an exit seal instead of an entry seal), and that I do not have to worry about it as they have electronic records. I didn't even know that they had messed up with their seal until he told me! Ok so that was fine.
However, I have read here that Schengen countries do not have a uniform database. I'm planning to make another trip of 2 weeks using the same visa with the entry point being Germany. Would there be any complications as I now have 2 exit stamps on my passport? (The visa start date was October 2, and the stamps are for October 2 and October 15) The officer in Iceland at the exit border control explicitly told me that there is nothing to worry about, but reading opinions here seem to imply otherwise.