Use some caution or have lower expectations with Zenni. At first, I really liked Zenni for the price and selection.
BUT . . . I bought from Zenni because I had lost my expensive pair of glasses. Months later I found the original glasses and I could tell that the left lens of my Zenni glasses was off,way off.
I think I got my money's worth from Zenni, but there may be times when their product is not 100%.
You could take the glasses to a regular optical store and see if they will adjust them. They may charge; they may not.