Google not fetching actual title of my website

Hello webmasters,
I am very confused about our website. When i am searching my website on google.com.au using
Best online bookstore keywords, the website title is only showing "Image Book Company". This problem is only coming in my website home page. i think this is also affect the ranking of our website. Please check it and help me to get out of that problem. my website is: www.imagebook.com.au/
Google not fetching actual title of my website

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