So pre-render everything looks fine but when i want to look at the render image viewport suddenly some objects have moved places! How can i fix this??? I can’t upload the image to show it but trust me i need help with the render image viewport
See the Animation timeline “any unwanted keys are there or not”
and
do clear parent(alt+p) of moving object
any problem on their then it was solve 
If it is not animation check that you do not have unwanted displacement modifiers (or displacement nodes in materials)
Welcome 
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you may have to check about different settings in "realtime (monitor icon) and in render (camera icon)…
…or may spent some minutes in the forum like mentioned in the FAQ to provide a screenshot ( Menu → Window => Save Screenshot ) while showing the settings…