conflicting two magento extension

Question

I have two same extension but both are using for a different-different purpose.

Extension A Config.xml

Answer 1

This is the same issue which i faced ,Currently you are adding before tag only in one extension so remove this line.

<before>fee</before>

you have to set the after and before tag in both of the extension.

In Extension A Config.xml file use this

<after>subtotal,discount,shipping</after> 
<before>tax,grand_total</before> 

and in your Extension B Config.xml file use this

<after>fee</after> 
<before>tax,grand_total</before> 

Hope this will help yours

Answer 2

The sort algorithm used by Magento is not stable and can lead to wrong results. You can use this patch: https://stackoverflow.com/a/11954867/288568