I'm guessing it's currency.
The US was closed Wesnesday, so many dollar denominated indices will not have changed. So currency change + a days worth of annual charges probably add up to -0.13%
The annual charge is reflected in the unit price on a daily basis.
I was just making the point that charges are reflected in the price daily (to correct what was said above)-I did not speculate on what was causing a uniform fall across the board.