Steps to reproduce:

1. Navigate to Monitoring -> Triggers.
2. Specify two values in filter by host inventory. For example:
   • Type: aaa
   • Type: bbb
3. Press Filter button.
4. Change "Type: aaa" to "Type: ccc".
5. Press Filter button.
6. Click on Monitoring -> Triggers in the main menu.

Result:
Observe that second filter by host inventory "Type: bbb" is now replaced with "Type: ccc".

The same issue appears in Monitoring -> Problems (3.4 and 4.0) when filtering problems by tags.
Steps to reproduce:

1. Navigate to Monitoring -> Problems.
2. Type two values in tag filter: 
   • database: customers
   • database: partners
3. Press Apply button.
4. Change "database: customers" to "database: orders".
5. Press Apply button.
6. Click on Monitoring -> Problems in the main menu.

Result:
Observe that second tag filter "database: partners" is now replaced with "database: orders".
Duplicate values are saved to database. So the problem is somewhere in CProfile::updateArray() and CProfile::update().