Why Google doesn't use my title tag?

[megavideolinks]

today, I check my serp ranking and see google show my title for some of my page is MAIN KEY WORD - MY SITE NAME.

i check my source code and my title tag is correct.

even I type site:url google show the same (keyword - site name)

Why that can be happend and how to fix?

 

[ePrime]

Google automatically changes title of pages according to the query provided, backlink anchors and automatically adds the site name to the title if it's not there (most of the time)
Check this out: https://searchenginewatch.com/sew/news/2342232/why-google-changes-your-titles-in-search-results

 

[clevelandslim]

Change your title relevant to your keyword

 

[jamesjk1]

Google's under no obligation to do what you want.

 

[megavideolinks]

What should I do? I dont want use only main keyword for my pages. The pages are using LSI in tittle shoud I change the LSI to my keyword?

 

[renzuken]

if your refering on the - Sitename
its maybe because of your onpage, maybe you have too much - Mysite on the footer links or anchor,alt on images
but why worry on that? having google aknowledging your brandname is a good signal
in my exp i rank better when google do that

 

[Nonilol]

today, I check my serp ranking and see google show my title for some of my page is MAIN KEY WORD - MY SITE NAME.

i check my source code and my title tag is correct.

even I type site:url google show the same (keyword - site name)

Why that can be happend and how to fix?

Your website is probably not listed in dmoz, is it?
I heard Google sometimes replaces title tags with dmoz data.

Are you sure your website has been crawled after you had changed the title tag?
I would let Google fetch it again using Search Console to make sure.