So a few days ago, some of my fonts were substituted for another font. I probably wouldn't have noticed the problem if it hadn't been for the fact that the font was hideous and properly called "ugly font". I should mention that researching the problem online didn't guide me to a reasonable solution. Maybe it was my inability to articulate the problem since I didn't know what was actually wrong but every guide I was finding tried to sell me or have me download some font app.
Anyway, I was able to figure out the font's name by looking through my fonts. I placed the font folder on the Dock and quickly scanned the fonts using the grid view. I've found this easy to find the font I'm looking for doing this rather than use the Font Book application. Equipped with the fonts name, I opened Font Book and searched for "Ugly Font". I quickly found the font along with a warning message. It prompted me to use the "Resolve Duplicates" tool to correct duplication issues my font system is facing. Using help, it directed me to the option; Edit > Resolve Duplicates. I quickly realized that "Select duplicated fonts" was only selecting one font at a time and resolving these fonts would take forever. So a quick solution I found was to choose "All Fonts" from Collection, then literally selected all fonts using Apple key + a, then again click edit and choose "Select duplicated fonts". This time around, it will narrow your selection to all the fonts that need to be resolved. Finally, click "Resolve Duplicates" and your system should now be fixed.
To see the fix, simply restart the application you're using or just restart the computer.
