Image alt text not showing on source code

Hi All,

I put alt text on my website images with only WordPress access but all alt texts don’t appear on source code.

This consume much of my time figuring out. I really need a help how to solve this. Anyone?

I am having a problem showing alt texts on the logos of this site- https://mypapercups.com.au

Also, alt texts on the first 2 rows of https://mypapercups.com.au/paper-cup-designs/ not showing up.