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Hi,

There can be a lot of reason. First i’d try to deactivate the theme and use TwentyFifteen to see if it’s a problem with the theme. If it solves the issue and it’s a premium theme, i won’t be able to help you.

Then if the situation is still the same with TwentyFifteen, i’d deactivate the plugins one by one to check if there’s an issue with one of the other plugins you activated.