Wildfires being swapped with multiple MCHs in the party

I would love to know why fflogs decided to swap my wildfires with the other mch in the party, excluding our openers.

The log in question: https://www.fflogs.com/reports/RCZyTmY1tQMzApn2#fight=19

This is what our wildfires look like in ACT: https://puu.sh/u6ZYL/a46e704c35.png

Nothing tells FFLogs (or ACT) who owns which Wildfire. We just have to guess based off timing.