Actually I was wrong.
I thought Robinson was doing fine because the line as a whole did well, but no. This is from PFF's 2017 wrapup.

15. JACKSONVILLE JAGUARS
Total pressures surrendered: 151
Best player: Brandon Linder
Combinations used: 14

Jacksonville’s offensive line had a lot of success in run-blocking as the 1.95 yards Jaguars running backs averaged before contact ranked second in the NFL last season. The unit was anchored by Brandon Linder, who has established himself as one of the best centers in the league over the past couple of seasons as he did not allow a single sack all year. Right tackle Jermey Parnell has been consistently solid for a couple seasons as well and similarly to Linder, did not allow a single sack all season. On the other side, however, rookie left tackle Cam Robinson went through some growing pains in his first season in the NFL as he played 13 games in the regular season and was called for 12 penalties in these games while he allowed at least three total pressures in 10 games, including the playoffs

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