Temperature reset before print started

So there is an STL file I sliced in prusaslicer and when I went to print it did my usual start gcode which has a purge line in it before it prints the file when it went to print the purge line it set both heaters to zero. That’s never happened before so I resliced it and compared the files and they are identical, it worked fine the second time. Any idea what would cause the reset of both heaters?