Make sure that both of those modules have some products to show.
For instance, if you choose "Featured" for "Product Group" (which shows only featured products) and you don't have any "featured" products at all, this means there is no product to show inside the module. So the module will gets hidden completely. This might be the reason why you don't see the 2nd module at all.
If the module(s) not showing at all in the website:
There is nothing wrong with it. The source of problem is about the configuration. Double check every module parameters.
If the 2 .module showing but not working:
This means there is a problem and we are here to solve it.
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