You have mixed MBR installs with UEFI. You can see at the top of the boot repair output that Grub is in the MBR. It should not be as you are using UEFI and there is a separate EFI partition on sda1 with both windows and Mint efi files. Boot repair might have installed Grub to the MBR, I don't know. If it did, that was a mistake. The link below explains why mixing MBR/EFI doesn't work.
https://help.ubuntu.com/community/UEFI
You might take a look at ubuntuforums as there are quite a few posts there with solutions to the problem. Don't use it myself so...