Cant understand how does ping and servers work

Before miami server came my ping was like this:
alfa-delta-etc etc..... 110-120

When miami server came out my ping was like this

alfa-delta etc etc ......110-120
miami...... 68-72

After halowwen patch came out my ping was like this

alfa-delta etc etc...... 95-105
miami..... 85-95

THIS DOESNT MAKE SENSE: If ima closer to miami why dit it raise in maimi and get lower in the other servers?

For Last after christmas patch my ping is now like this

Alfa-delta etc etc..... 120-150
miami 68-74

Why does my ping keep going up or down?
How can I have some times almost same ping in miami and alpha?

Im confused gelp me out guys

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