It looks to me like the K/Q variant in Exodus 21:8 is not labeled like all the others are. The Qere is shown in black text, whereas all other Qere readings are usually shown in blue text on the OSHB Read page.
This comes from the coloring for the segmentation. Normally, prefixes are blue, with a word in black. Here the "word" would be blue, so the prefix becomes black.
It looks to me like the K/Q variant in Exodus 21:8 is not labeled like all the others are. The Qere is shown in black text, whereas all other Qere readings are usually shown in blue text on the OSHB Read page.