Probably something like this happened, which is to common on the Valeo starters and why I refuse to use them. I just have the Bosch ones rebuilt locally.
This one was a Carquest 'lifetime' that was 6 months old, you can still see the scan tag on it. They took it back but didn't have another so they upped me to a Bosh remained since it'd be a week to get one of these in stock. I got lucky and have even had to have the remained Bosch rebuilt since then, but now it's still going strong since my rebuilder uses better parts. And yes, it was tightened properly, the casting was junk from the factory, even the counter people at Carquest couldn't believe how crappy it was.
I agree on finding a shop to replace the clutch. But if you're even remotely mechanically inclined it's not a hard job, and you can replace seals they'll miss while you're in there.
Good luck.