How to measure resistance of resistor in PCB?
If the resistor is placed in a circuit. Then you'll measure the
equivalent resistance value of the resistor parallel with the rest of
the connected circuit. Just like here every component has it's own static or dynamic
resistance, a diode, transistor, ic... If you now measure the
resistance of a component none of them will show it's own resistance
but only the circuit resistance.

It can also be that you've made a bad
soldering connection and short the other end also to the
ground-plane.
Another option is maybe a residue of soldering flux around your
component shorting it's terminals. You can remove this with a cotton-tip and the right product.

If you can upload the whole schematic and provide a picture of your
soldering connection, maybe we can help you better.