F-15/flanker top speed?

Why is the flanker faster at sea level and at altitude compared to the f-15? Should it not be the other way around? The top speed in the stat card of the f15 is also wrong, it won’t reach it at that altitude

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Top speed at ±100m altitude on test drive, both are clean and with all modifications.

F-15 - 1462 km/h
Su-27 - 1537 km/h

On top of that the flanker accelerates faster than the f-15 after Mach 1, and from the standstill on the runway as the engines build thrust faster. The F-15 only accelerates faster till Mach 1 after the engines build some thrust after takeoff.