It looks like the reflashing process didn’t complete or maybe it does the partition resizing on the first boot after a reflash.
Is the phone shutting off after being powered on? You may need to reseat the battery and may want to follow Purism’s recharging procedure in case something may not calibrated correctly. Purism doesn’t charge the devices they ship at 100% so make sure that your device either has enough battery to boot or is charging.