With D+/D- short, the input current limit is 2.4A. With RICHG=1.5k, charge current is 450mA. What kind of load hooked on your Boost output? What is Boost voltage when you switched K1? What is your Boost regulated voltage? Can you turn on K1 switch after Boost is in regulation? Looks like Boost overloads the charger? For your 5V/2.5A power supply, do you have constant current limit? When Boost takes more current than charger can provide, charge current will be reduced and stop charging and charge current could be negative and the charge goes into supplement mode.
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