While it's not great for a tight end, I believe this is more bad luck/bad utilization from the coaching staff. He was not receiving targets in the redzone. Jimmy Graham and Jesper Horsted were getting the bulk of the action near the goal line. This is a mystery as to why this was the case, but it still was.
However, I believe that if he gets used a little more as a redzone threat, the scores will come and he can really turn into a top 10 tight end in the league. Justin Fields is known to love his tight end a lot.