Because in many cases, having two consonants (those hard sounds like “k”, “p”, “s”, “t”, etc.) next to each other makes the vowel (open mouth sounds of a, e, i, o, u) a *short* sound instead of a *long* sound.
“Stoped” would not sound like “stopped” does, it would sound like “stoh-ped” (rhyming with “soaped”). To maintain that “ah” sound, they add the second p.
To my understanding, it’s to make it clear you aren’t using the past tense of a different but similar word. In your case of stopped, stoped could be the past tense of either stop or stope (don’t think that’s a word but play with me here). A better example is hoped or hopped. One consonant between a vowel and ‘e’ makes that vowel long, but put two consonants and that property goes away.
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