[otrs] udpate to SLA or State changes priority automatically

Hi ALL I have following issue: a new note is added - if now an update is made to either the ticket Type or a new state one can see a short refresh (a small animation next to these fields) and the ticket priority changes for the first available one in the list. -Ticket priority very high change as low . if try to update priority it take as low only . Any ideas how to prevent this? Thank you & Regards, Kalyana chakravarthy M .P,