How to read the resistance of a digital potentiometer
It looks like you have the SHDN pin tied to ground. The bar over the SHDN label means it is active low. This means that tying it to ground activates that circuit. According to page 20 of the data sheet you linked above, that will open circuit the devices.

"Both parts have a power shutdown SHDN pin that places the VR in a zero-power-consumption state where Terminal Ax is open-circuited and the Wiper Wx is connected to Terminal Bx, resulting in the consumption of only the leakage current in the VR."