I installed a Keyman GFF Amharic Keyboard on my computer which has a macOS Mojave 10.14.5 operating system. Some of the combination keys on the keyboard don’t work properly. I deinstalled and reinstalled the keyboard again and again but with no change. Here is an example from my sample writing: ህa ህu ህi ህa ህie ህ ህo (the correct outcome should look this, ሀሁሂሃሄህሆ).
another example, ስeልaም => the correct one should look (ሰላም)
Please let me know, if there is anything I can do to solve the issue. Thank you for your time and expertise to help me solve the issue.