How to augment multi_variate time series data?

I noticed that while augmenting multi-variate time series data, augmented data is concatenated on 0 axes, instead of being added to a new axis ie third axis.
Let suppose data shape is (18,1000), after augmentation it turns to be (72,1000), but i believe it should be (4,18,1000). simply reshaping data.reshape(4,18,1000) resolve the problem or not?