Incorrect ordering the list of triggers after saving the map

Precondition:
mysql database

Steps to reproduce:
1. Create map with trigger map element
2. Add 3 triggers with warning severity
3. Save and exit map
4. Edit map, change triggers ordering
5. Update and exit map
6. Edit map, check triggers ordering

Actual result: incorrect ordering (sorting by trigger id)
Expected result: remembered chosen ordering after map update