I don't think anyone involved in production ever gave a reason.
Most people here believe the series had stopped at 13 because that was the first sequal to end up in the red, snd they probably didn't want to go any further and possibly lose more money. They also mostly think Universal really only decided to do 14 because they had new Jurassic Park movies in production, and they just thought they could actually make a profit from releasing a kids dinosaur movie after Jurassic World came out.
Though, from numbers Rhombus have posted, it doesn't seem like it made much money. Doubtful at this point if movie 14 actually ended up making any profit at all. it most likely ended in the red, just like 13.

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(Runner-Up)
