I noticed that stats values bellow some pages/posts remain at small numbers (for example "1", "5", etc.). I searched for the cause and I found that these items have duplicated "views" meta_key. Several items had 5 or 7 meta_keys "views". And when any item had more than one meta_key "views", then function the_views() showed only "1" views (on frontend and also in administration) even if the value for duplicated meta_key was right, for example 3456.
Any idea, why meta_key is duplicated sometimes?
Thank you for your help!