If the jars sealed properly they will be safe. You may have had the spring lid on too tight which caused too much pressure to build up before the purge occurred and a lot was forced out. Spring lids should only be on finger-tight. The headspace is the air space that is normally purged out during the heating and expansion during processing.
Another cause is exposure to a sudden temperature change, especially if there is a draft when the lid is removed. When the heat is removed, wait a few minutes for things to cool down a bit before removing the lid.
Support bacteria. It's the only culture some people have.