I am getting a lot of missing title tags on google webmaster tools. The strange thing is that my <title>...</title> is correct popullated! When checking page source, I see the title correctly.
Any ideas on what might causing such an issue?
My store is https://e-chap.gr
Following what you shared, it is a crawling issue (possibly indexing). What is live is not always seen by Google. In addition to that, the HTML Improvements section of GSC can take a few days/week to update. To diagnose and solve that amongst other SEO problems, follow my complete Shopify SEO guide: https://www.digitaldarts.com.au/the-expert-guide-to-shopify-seo