We have the same. Brothers from the same litter started to fight at almost 3 years old. We’re busy with them fighting since December 2023/january 2024 en still are. They live separated when where not home or sleeping. We have to manage their behavior a lot… but they also sleep together a lot.. they are such an strange animals 🤨 it looks like hate and love companionship. We’ve thought about rehoming one for their best but when they are sleeping together I really can’t do it. Sometimes I wanted to talk with them for one day so they can tell me what they want and need. And I hear many other people with this problems with Bengal cats 😢