I just looked and I have everything locked. That was fast. But, I just had one advertiser last month maybe that's why.
Some Advertisers like eBay for example have performance incentives (bonuses) the more sales you make the higher your commission/lead per sale or CPA. That shows up as figure on your account just before locking dates as a "bonus" ..
Corrected means that the advertiser reversed that commission for some reason (unqualified lead, product return, subscription cancellation, invalid credit card, order cancellation, etc...).