I think some of that has been injuries, some of it guys playing out of position, and some a schematic choice. Ceyair Wright emerging has been great, but with Hill hurt we've still had to either leave Buford at corner or play Charles. Buford just isn't very twitchy or tall, and Charles will be good but doesn't look ready. And then the final piece is you can't take away everything as a defense unless you have Georgia/OSU/Bama level talent. We prioritize stopping the run and not giving up big plays, which has generally worked out well. But doing both of those well makes it really difficult to defend short/intermediate passes.
I think the growth of Wright has been impressive, and Buford playing corner has had some expected bad moments but he's in position most of the time. I haven't really had a problem with the DBs overall, wish they'd make a few more plays on the ball but IMO all a coach can do is put them in position and they have to do the rest. Gifford and Singleton are good players, just don't have "it" as far as taking the ball away. Hartzog/Buford do to a degree, but they have physical limitations.