Steps to reproduce:
- Create map with 2 elements of type 'trigger', each linked with different trigger. Save it;
- Enter edit mode;
- Change the first element's type to 'host' and press apply to confirm changes;
- Now, click on the second element to open its properties window.
Second element now have 2 triggers linked to it - one from the first element as well as the original one. Pressing 'apply' user can even save that.
Trigger from the first element should be forgotten since it's map element now has changed the type.