Can you consider when uploading products on your website, did you add your brand name? And maybe you're using an app that can edit your meta titles. This doubling your brand name.
In the second case, you are installing 2 apps having meta title optimization features.
Google has a tendency to append brand to the end of a title tag where it thinks it's confident of it. I think the question here is - how much do you mind it being added to the end? I think unless it's causing active harm (which I think it probably isn't) probably most effective to just leave it and focus on other On-page Optimization tactics like Body Content, URL, H1, H2, Image ALT tag, Meta tag and Page Speed.
Let me know if my answer is of any help with a thumb up or lie. Cheers
My Qustion is, Is it going to damage my organic traffic in the future because I am having a issue on google search console that it is saying Top Warnings.
Any Advice, btw thank you for replaying my message.