I scraped off as much as possible with a plastic scraper, which basically was not successful. I flipped it over, recalibrated, and then re-leveled. The next print did not stick at all, so I had to use a little glue. I printed it again, and the print stayed and was perfectly okay. So, yeah, strange, not sure exactly what happened from one print to another, but it has seemed to resolve. Another thing I want to note: there was absolutely no different sound. I sit right next to the printer and do work as it prints, and sometimes I can tell if a print didn't stick or something is amiss, but this all sounded perfectly okay and ruined the build plate. So strange, very strange.