Oddity with Glow-Inside

I'm trying to create a map with a dark and moody setting and was playing around with the Glow-Inside effect. I want a dark inner glow on the floor, but end up with an odd artifact when I increase the Strength to 1 (or higher). I'll probably just stack multiple glow effects to get what I want, but wanted to see if this is a known anomaly.

This is a 30' x 40' room.
First image is Glow, Inside, Strength:0, Blur Radius:10
Second image is Glow, Inside, Strength 1, Blur Radius 10

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