Please help me correct the grammateical mistakes and let me know which grammar principle it violates to

Question

You should have read the instructions carefully before washing the sweater, as it will shrink if you wash it at too low a temperature.

Answer 1

You should have read the instructions carefully before washing the sweater, as you can see it has shrunk because you washed it at too low of a temperature.

Tow different tenses, the whole sentence should be in the same tense.