I got this:


Itinerary

Qatar Airways(Q.C.S.C) Paris (CDG) to Doha (DOH) - Sun, Dec 14
Qatar Airways(Q.C.S.C) 40 Dep: 3:00PM Arr: 11:25PM 6h 25m Airbus A380 Economy (Q), Economy (O), Economy (N)
Layover in DOH 2h 30m

Qatar Airways(Q.C.S.C) Doha (DOH) to Bangkok (BKK) - Mon, Dec 15
Qatar Airways(Q.C.S.C) 836 Dep: 1:55AM Arr: 12:10PM 6h 15m Airbus A380 Economy (Q), Economy (O), Economy (N)


Bangkok (BKK) to Paris (CDG) - Tue, Jan 6
Qatar Airways(Q.C.S.C) Bangkok (BKK) to Doha (DOH) - Tue, Jan 6
Qatar Airways(Q.C.S.C) 837 Dep: 1:40AM Arr: 4:55AM 7h 15m Boeing 777 Economy (Q), Economy (O), Economy (N)
Layover in DOH 3h 10m

Qatar Airways(Q.C.S.C) Doha (DOH) to Paris (CDG) - Tue, Jan 6
Qatar Airways(Q.C.S.C) 39 Dep: 8:05AM Arr: 1:10PM 7h 5m Airbus A380 Economy (Q), Economy (O), Economy (N)

Fares

Fare 1: Carrier QR QPEE3MFR PAR to BKK (rules)
Passenger type ADT, round trip fare, booking code Q
Covers CDG-DOH (Economy), DOH-BKK (Economy)
£100.94
Fare 2: Carrier QR QPEE3MFR BKK to PAR (rules)
Passenger type ADT, round trip fare, booking code Q
Covers BKK-DOH (Economy), DOH-CDG (Economy)
£100.94
French Aviation Civile Tax (FR) £6.20
French International Passenger Service Charge (QX) £22.50
French Airport Tax (FR) £10.10
French Air Passenger Solidarity Tax (IZ) £3.60
Qatar Passenger Service Charge (PZ) £0.60
QR YQ surcharge (YQ) £183.60
Thailand Passenger Service Charge (TS) £13.60

Subtotal per passenger £442.20


And QR's fares:

OPEE3MFR $255 (O)
QPEE3MFR $317 (Q)
NKRTFR $378 (N)
SKRTFR $462 (S)
VKRTFR $565 (V)
LKRTFR $693 (L)
MKRTFR $846 (M)
KKRTFR $1000 (K)
HKRTFR $1167 (H)

Availability on the 14th for the selected flights QR40/QR836, from Expertflyer:

F6 P5 A4 J4 C3 D1 I0 Y9 B9 H9 K3 M0 L0 V0 S0 N0 Q0 O0
F6 P5 A4 J4 C3 D1 I0 Y9 B9 H9 K3 M0 L0 V0 S0 N0 Q0 O0

So I think that is actually a K fare, pricing up at $1000++, rather than the $317++ Q fare ITA claims.

Am I missing something, or is it a bug?