Sprintec vs. Mono-Linyah

I've taken Sprintec(brand) birth control pill for years and never had any problems. I love it ..and I've had to take mono-linyah (generic equivalent) cause the pharmacy is out of the sprintec kind. I've experienced very bad, vivid nightmares since being on mono linyah.... It's the exact same medication and dosage, the only difference is the brand supposedly. Has anyone else had this problem or similar problems with these pills?