Set repeat time from Flow Designer started on specific state

[MohdAr]

I have requirement to trigger email reminder every 2 hours start when case's state = Open.
I have create flow designer as below but here the result and it didn't meet my expectation.

Result
Case A opened on 10:30am -> reminder 12:00pm -> reminder 2:00pm -> reminder 4:00pm
Case B opened on 11:45am -> reminder 12:00pm -> reminder 2:00pm -> reminder 4:00pm

Expectation
Case A opened on 10:30am -> reminder 12:30pm -> reminder 2:30pm -> reminder 4:30pm
Case B opened on 11:45am -> reminder 1:45pm -> reminder 3:45pm -> reminder 5:45pm

Any idea how I can alter the flow to meet my expectation?

[MohdAr]

Currently i am using repeat trigger, but it will trigger simultaneously at all cases even though case opened at difference time.