During bed leveling it cuts all power to heaters (bed and cores). When leveling is over it has to heat everything back up to temperature. While it is heating up, the plastic expands and some filament leaks out. But it should then start printing the skirt (or brim) and get connected to that instead of to your print.
Could that be it?
Also when it is finally ready to print it does an "unretract" because it retracts at the end of the previous print.
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Smithy 1,146
Are you sure it is a purging and not only an oozing material during the heat up of the nozzle?
Depending on the material (PETG i.e.) I see from time to time some material oozing on my S3, but never so much that I had problems.
Do you have a picture?
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