world texture issues

Hey, I desperately need help. For some time now, I've been having a problem where my worlds aren't displaying correctly. I've noticed it especially in Brindelton Bay, Ravenwood and Willow Creek. Objects, trees, and plants in general are missing from the background. Yes, I'm playing with mods, but I've also had this problem when I've removed them from the game. I've already deleted numerous files so they could be regenerated, reset my graphics settings and then raised them again, and even uninstalled and reinstalled the affected packs. Nothing works.