I already fly my first segment. HND ->xDFW->BUR(Already flown)

I changed my routing and date, but it still remains DONE4.

When I call AA today for payment, the changing fee is $800+ per person for fare difference + YQ and Tax. I asked them again, then they lower it to $600.
I already flown:
HND -> xDFW -> HND

Before:
BUR -> xDFW -> SCL -> xMIA -> LAX -> ANC -> LAX -> xDOH -> CAI /SAW -> xDOH -> MLE -> xCMB -> PEK -> HND

After:
BUR -> xDFW -> SCL -> xMIA -> LAX -> xDOH -> AMM -> CAI/SAW -> xDOH -> MLE -> xKUL -> PKX/PEK -> HND

- No new continent.
- Routing change is also minimal. I dropped LAX-> ANX -> LAX. Add AMM -> CAI segment.
- MLE -> xCMB -> PEK needs to change to MLE -> xKUL -> BJS because UL does not operate this route around Dec.

Is it normal to have charge fee for reroute. Based on rule, I thought it suppose only be 125 after the first segment.

"2. After departure:
a. Changes are permitted provided ticketed points remain the same.
b. Changes to ticketed points are permitted at a charge of USD 125 per transaction.
c. No Show requires rebooking at a charge of USD 125. d. If the rerouting results in an increase to the number of continents previously charged, the ticket shall be recalculated. Ticket may be reissued to any applicable Explorer fare validating all rules of the new fare except for restrictions on retroactive use. Rerouting fee applies when the resulting fare is less than or equal to the original fare. No refund applies. See Upgrading provisions when recalculation results in a new fare basis at a higher value."