Hi Pilot 10000
We regularly land with 80-90kg of fuel remaining and often see the following sequence:
In the cruise, fuel decreases till the aft pump is uncovered, followed by aft fuel pump light a little later. Reach up, switch off aft fuel pump.
Approaching final, gentle decelerative attitude to reduce speed. Front pump becomes uncovered. No warning light because of the inbuilt delay but fuel now not being transferred.
Supply tank contents drop, followed by FUEL caution and then finally the fwd pump caution illuminates.
That may offer an explanation for what you see.
Cheers
TeeS