Utah vs San Diego St weird 1h line movement

[rfr3sh]

POINTSPREADS
02/08 10:08 +9 -108 / -9 -108
02/08 10:16 +9½ -106 / -9½ -110
02/08 10:34 +9½ -105 / -9½ -111
02/08 11:07 +10 -105 / -10 -111
02/08 16:27 +10 -108 / -10 -108
02/08 19:17 +10 +100 / -10 -117
02/08 19:19 +10 -101 / -10 -116
02/08 19:24 +9½ -103 / -9½ -113
whyd it drop