The below should be valid in general, which is why I'm still posting it, to help others. However in your case, something seems off, which is why a support ticket was opened to investigate.

A “Properties Changed” alarm event can be due to a change in alarm properties, but also element/service/view properties. To find which property got changed, you can check the Alarm Details (right pane “properties”) to figure out which property/properties got affected:

=> By checking the different alarms within the alarm tree, you should get an understanding what property changed and with which value.

Below, I’ll describe how to disable these alarm events, however a disclaimer:
There might be a reason these property changes trigger new alarm events, they might trigger a correlation rule for further actions, so please be aware of what you disable.

As mentioned there are different properties, each able to trigger such an alarm event. A quick summary how to check:

Alarm Properties

In the Alarm Console, right-click any alarm and go to properties:

• General Alarm properties
  
  Disable the checkbox for any of the properties (right side) that shouldn’t generate an alarm update, when the property changes.
• Custom alarm properties
  
  For every custom property (here only 1), you’ll want to edit the property (in step 3) and disable the checkbox in step 4.
  

Ref: Changing custom alarm properties | DataMiner Docs

Element/Service/View Properties

All other properties triggering such alarm events can be found via C:/Skyline Dataminer/propertyConfiguration.xml.
=> search for “doUpdateAlarmOnValueChange=”true””, via notepad++ is easiest, for example:

How to view these within Cube?
Right-click the element/service/view > Properties > Custom > select a property > Edit

Ref: Managing custom properties | DataMiner Docs > Update alarms on value changed.