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Google search shows random alt text of images in my site instead of the meta description tag text. I couldn't find similar problems on the net so I guess I'm doing something wrong, but what is it?
If I delete the alt text, it shows some random text from the footer.
Well, in my experience, google shows well some low-volume keywords and related keywords with your main keyword in alt text of images. If you delete alt text, you can see some low-competitive keywords and related keywords. If you have no other related keywords in your page, maybe shown text will be related with backlink texts. The possibility of upper case is about 30 ~ 40% in my experience. This is just my experience. The result may be different from other cases.
