I have never seen this issue on none of our clients or my website, that's why I can only guess.
Is there any content that you have add? or there you have only demo content ?
You can install "empty/standard" Joomla 3.x inside folder and than install template and copy few mysql tabels from first installation, I can help you with it- so you won't lose any important data. ---> write a PM
Than upload/replace files or only configuration.php - that's all ---> 20 minutes job.