Instant mash potato points

Im confused. Can anyone help with a query on instant mash? On the app, if you type in potato - it has 'potato, instant, made up with water - 0 pp. ' Then if you type in ' instant mash' all the results show they have between 4 and 12 pp! Ive been having tesco own brand instant mash made with water and now i dont know what to think!
 
Smash is 3pp for 30g dry made up with water so i would think the tesco one would be about the same.
 
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