G1 -> G2 Album highlight photos and imported photos have been resized by somewhere setting

After the G2 installed, everything is Okay. Just i migrate all of the Albums and photos from G1 thru the migrate tools in import section. All the photos and album photos have been resized to 640x640 automatically even i modified the Theme setting and Edit default album setting from 640x640 to 800x800 or deactivate this resize function.

How can i modify the migration template to change this hardcode setting to my customize setting??

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G2 version: 2.2.1
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