Jobs getting stuck on the server

On the 18th of June I submitted an I-TASSER job (ID: S550449) which was approximated to be ready in about 35 hours. However, the job hasn't been completed yet and is still 'in processing'. I used I-TASSER in the past and it never took this long, is it because of the server overload? At the same time jobs submitted at the same time as mine and after are completed normally. Thank you.