GMail Spam Filter

For some reason my GMail spam filter seems to be..well..turned off for the past day or two. It's not completely off, as one or two emails are marked spam but the vast majority of spam is just getting dumped into my inbox. Historically GMail has been pretty good at filtering most of the spam so I'm not sure what's going on. It really does feel like the filtering has been switched off. But there doesn't seem to be an option to actually do that (or turn it back on).

Hopefully it fixes itself soon.