@st0kicha it’s hard to answer for a variety of reasons. Do keep in mind the information provided at Creating Topics if you post in the future. Not only is this in the wrong category, but you provided very little information which makes it difficult to help you.
I’m primarily going to answer you and assume desktop. But with not hearing if it’s Android, Windows, Mac, Linux, iOS, etc it can be tricky. Each has some slightly different settings and capabilities. Such as how desktop can use extensions but mobile can’t.
The primary thing I’d suggest is for you to double check your settings. Settings → New Tab Page is set to open what?
Then Settings → Get Started → On Startup is set to what?
Your Home button is set to what? Settings → Appearances → Show Home Button
Those aside, we don’t know if it might be an extension you have that’s trying to open anything. Can you disable your extensions and see if it makes a difference?