pumpkin seeds not being pumpkins?

[valid spoke]

so i planted some pumpkin seeds but for some reason they are growing as watermelons. i know i didn't mix up the seeds because i only had 1 watermelon seed left after planting so decided to switch to pumpkin. i planted the pumpkins where the off colored watermelons are

[dark moss]

Google what unripe pumpkins look like!