As far as I know, in “white” LEDs the light from a blueish LED is converted into longer-wavelengths using a photoluminescent dye. The yellowish dye together with the blue LED creates a broad spectrum which appears “white” to the human eye. The white-LED spectrum below (taken from data sheet some years old) shows more clearly than the above spectra of your LED the sharp peak of the blue LED and the broad photoluminescent response from the yellowish dye:
With a little bit of imagination, you can see these two contributions (narrow peak from LED, broad peak from surrounding photoluminescent material) in the spectra of your LEDs as well.