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I have not been able to replicate this issue. I am using several accounts as well as and it redirects me to the right one every time. 

However, the interface to the Gmail app is undocumented and unofficial, so there's no guarantee that it will always work. 

I hope you will still find the app useful and consider a purchase.

Can you tell me the version number of Gmail Widgets you are using and your operating system version? Thanks.

You asked how to resize a widget. A lot of people don't know that, so I just gave you the standard answer. If you have tried that and it doesn't work, the issue is with Samsung, not this app. 

It's the same on all devices running Android 4.x. See also this video:

You can resize widgets by long-pressing on them. See this tutorial video:

Not enough detail to investigate.