Q: Bold letters option isn't working

AAnything that requires keyboard i.e text messages, WhatsApp etc..

WWhat do you mean? Apple is aware?

AM I the only one who noticed that?

I Even tried it on 6+ and still not working.

Just in case someone else come across this issue, I found the reason

for why it happened to me- bold letters only work with default font size.

if you increase the size of the font it won't work. That's a bug in apple's design I think