Double/overlapping titles

Hi there.
I know there are a couple of threads on this topic already but i have tried to follow the steps suggested in other threads to no avail.
For every post there are two titles, one in larger font on the left and then another on the right of the screen in much smaller font. If my post titles are long, they overlap. I’d like for the smaller title on the right to disappear!
Any idea how i might fix this?
Thankyou,
Megan