18 is correct. According to the Attributes Predictor and Unihan data, 羊 is 6, not 7. Both give 10 strokes for 羞.

Re Comment #1475


IRG N2862R #7Dd shows the value should be 7.

The current Unihan data shows varying counts for the sheep radical in this position, although 7 does seem more common. It seems somewhat more intuitive to use 6, since the base character is 6 and the design of many glyphs use the base ⺶, not the ⿱𦍌丿. Either way, we need to update the unihan data and tools.

Per Rule #7Dd in IRG N2951: SC = 13; FS = 3; TS = 19

#14526 illustrates why Rule #7Dd separating ⿱𦍌 and 丿is problematic. Intuitively, and following the 說文 and other analysis, many would consider ⿱𦍌丿 a variation of 羊, so the 丿 should count as part of the radical, not in the SC. #7Dd should only change the TC here.