[BUG] Unfolded trajectory does not make the trajectory contiguous

[ChiCheng45]

Description of the error
Running the unfolded trajectory with the DL_POLY water trajectory does not make the trajectory contiguous. Additionally when atom selection is used the job fails with a broadcast error.

raise TypeError("Can't broadcast %s -> %s" % (source_shape, self.array_shape)) # array shape
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
TypeError: Can't broadcast (766,) -> (768,)