Steps to reproduce:
1. Create Host 1 and Host 2
2. Create Trigger 1 for host 1
3. Then create Trigger 2 for host 2
4. Create map, select in properties "expand single problem"
5. Add trigger map element with Trigger 1 and 2
6. Make Trigger 2 in problem state
7. Make Trigger 1 in problem state

Result: displayed trigger with highest ID (Trigger 2)

Expected result: displayed last problem trigger (Trigger 1)
For host map element work fine, displayed last problem trigger
Also maybe rename "expand single problem" to "expand last problem"