Can You tell me what theme do u use? Also if you have 'cleared' your titles section in header.php
Archives is some kind of defoulth for categories so its better to remove f.e. you haev Music Archives | TheDrainage...
I dont know where it comes - after your titles.. but i know this shuldnt be Seo isue as your titles are without -
It will be helpful if you send screen shot from your post titles SEO settings.
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wellbeingtips on "[Plugin: WordPress SEO by Yoast] titles"
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