To fix the EFI System Partition for Multi-booting, you will need to boot via USB or make changes to GRUB since GRUB will not boot macOS.
Demonstration of Triple Boot
Configuring the Triple Boot
Post Installation
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Stephan Pringle
Technology Support Specialist at Sipylus
About The Author: Stephan Pringle is an Information Technology Support Specialist. He covers hardware and software and provides tips for you to troubleshoot and repair issues on your own. In his spare time, he writes articles about the State of New York on his Hackintosh and HackBook and that has helped him to become the top contributor of the New York City section of Yahoo! Answers.