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I have installed clean Magento EE2.3 . after I have moved to production mode I got 2 big problems.

1) when I look on the product page I can see it being resized to a different size with white lines. look at the original image that has been uploaded:

this is cache images:

https://babybeddingdesign.com/pub/media/catalog/product/cache/b3b166914d87ce343d4dc5ec5117b502/d/u/...

this is original images that were upload (just remove cache):

https://babybeddingdesign.com/pub/media/catalog/product/d/u/dumbo_bedding_set.jpg

2) on Magento EE2.3 when a buyer goto checkout without been register Magento gives a message of

Solution for Problem 1:

White border issue

After creating a plugin to convert the string value to an integer (which properly casts to a boolean), the image frame is not added. For details see this https://github.com/magento/magento2/issues/4622

public function beforeSetKeepFrame($image, $keep)

 if (is_string($keep)) 
 $keep = (strtolower($keep) === 'true') ? 1 : 0;
 
 return [$keep];

For Resize issue:

In etc/view.xml of your current theme, you can update product image size.Make sure you resize with the expect ratio.Use additional tag <frame> to prevent white borders on image.
Example Code:

<image id="product_page_main_image" type="small_image">
 <width>460</width>
 <height>460</height>
 <aspect_ratio>true</aspect_ratio>
 <frame>false</frame>
</image>

Check all other tags, not just a tag with the id product_page_main_image check others too.

Solution for Problem 2:

Go to Stores > Settings > Configuration > Customers > Reward Points

You may disable the reward functionality do whatever configuration you want to do like display on store front, reward point expiry calculation etc.

Reference: https://docs.magento.com/m2/ee/user_guide/configuration/customers/reward-points.html

I hope this will help