So, I have been playing forza for a while and I have 14/15 barn finds. But i have been playing for hours and I haven't gotten the last barn find, is this a bug or is this supposed to happen
It's hard for me to tell precisely which one you're missing, but I'm near certain it's the barn find you get for buying the La Cabaña house on the western side of the map. As far as I know, it's the only one that doesn't open automatically.
The house is only 150,000 credits so you should be able to afford it easily.