Why does Spotlight think "CHROM" matches Chrome, but "CHROME" matches Calendar?

This behavior has been consistent for months, maybe even years at this point, and I finally decided to make a screen recording of it just to have some verification that it's really happening. The steps are: 1. Command-space to open Spotlight search. 2. Type the letters C, H, R, O, M, E in order with pauses. 3. For CH, CHR, CHRO, and CHROM Spotlight thinks the best match is Google Chrome... 4. But as soon as I add the final E, Spotlight thinks the best match is Calendar. 5. Delete the final E and Chrome comes back to the top of the list... 6. Re-type the E, and it's Calendar again. Video evidence: https://youtu.be/nkWuhXLrN1I I just can't think of any rational text matching/lookup system in which this behavior makes sense. What on Earth is Spotlight doing?