Quite simply, the published pay scales are out of date. They are dated 1st Jan 2018, which pre-dates the 2019 strike and subsequent settlement, and BA has not bothered to update them since.
On top of that, all BA pilots are subject to a “Delta” pay deduction; in simple terms it is the company charging us for keeping senior (expensive) pilots rather than junior (cheaper) ones when Covid hit. They are making us pay to have a seniority system. As is the BA way, the formula used to calculate the “Delta” is so complicated that no-one understands it (and the union disputes BA’s numbers in any case) and there is no end date to the pay deductions.
Therefore:
Current pay scales are not published anywhere official, and we are left to guess what we should be earning,
Pay is subject to ongoing variable deductions.
No-one knows when the pay deductions will end.