Violet, NUV and UVA LEDs, usually have a broad emission from the red to the blue, emitted as a byproduct. Either the body of the LED itself fluorescence, or part of the die fluorescence.
Anyway, the violet part of the spectrum is too intense for a UVA LED at the range of 350-370nm. Looks like the violet/NUV 390-405nm one. They can also causes fluorescence on paper.