Keyword problem involving word "reflective"

i have keyword set has nested keyword inside of called "reflective." have 200 jpgs labeled keyword (it looks subject>still_life>reflective) set add parent keywords on export.

 

when import new photos (usually jpgs without keywords or other info), virtually every time new keyword "reflective" shows up, not in nested hierarchy it's supposed be, sole keyword @ top of hierarchy. there 2-6 photos there. when @ 2-6 photos, photos had already imported , keyworded in nested "reflective" hierarchy. not in nest, out on own rogue keyword won't stay in place. happens word. have check "reflective" in nested hierarchy , uncheck rogue "reflective" , delete remedy problem. doesn't sound big deal, gets extremely irritating have every time. why won't keyword stay put?

 

i don't know why happening, if it's bug or doing wrong. have many nested keywords , none of other ones pop out of hierarchy.

did check preset settings/develop settings?

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