They should be fine, but may discolor over time from the air in the jar. Just use those jars first.
Excess purging can be caused by a couple different reasons, the most common is having the spring lid on too tight (finger-tight only) which holds back the normal purging until pressure builds and purges suddenly, causing more than the headspace to be forced out.
Another is exposure to any draft or sudden temperature change, during processing or sometimes when the lid is removed.
After the canner returns to normal temperature and the pressure regulator/weight is removed, wait another 10 minutes before removing the lid to allow the jars a little more time to cool down before being exposed to the shock of room temperature. Also make sure there are no fans or drafts blowing around the canner.
Support bacteria. It's the only culture some people have.