Obscure Factor Affecting Credit Score

Hi - I'm Mike [removed] from Texas.  I have a credit card account with Target. On this month's statement Target lowered my credit limit  from $2000.00 to $1000.00. I haven't charged my Target card since FEB 2020, while maintaining a zero balance. The  next day I received alerts from the big 3 scoring services that my FICO score had decreased by up to 16 points! Question: do the Big 3 consistently drop scores because of a lowered credit limit?