Doubt it was heated and shrunken, it more likely to be stretched when heated, and when compressed it will be wrinked (maybe it is but cant see from photos).
The idea you suggesting that it was printed on a different sized plastic, would mean there should be a design cutoff or there was something of a change that was recorded.
For me the most likely is that it is some sort of counterfeit note that just happen to be someone not getting the size right.