Shopify is adding domain name at the end of several product title tags by default. This extra title isn’t visible on SERP, but it comes as an error as exceeding the character limit when doing the site audit in Ubersuggest.
Thank you for that additional information and the screenshots. I understand you are concerned that your product titles are too long when third party SEO tools are reporting that they also have the website name appended to them.
Shopify SEO is optimized for search engines. While it may be reported using this tool as being too long or not properly optimized, our site structures are and the product title length should not be causing any actual issues.
Editing how these titles are reported to a third party SEO tool would be outside of the scope of support from Shopify services. I am not sure if this could be changed or not. Maybe one of our partners in the community with more SEO experience can chime in with more information.