Ancestry has a peculiar way of identifying haplotypes. When they say "Ireland," they mean Ireland and Scotland.1 When they say Great Britain, they mean that they don't distinguish between England, most of Scotland, and most of Normandy.
The results look fairly accurate. My maternal grandmother is Irish—both her parents immigrated to Canada from Ireland in the late 1800s. They descend mostly from English settlers who moved to Ireland in the 1600s. That's why I'm not 25% Irish.
My maternal grandfather is a mixture of English, Scottish, French and Dutch ancestors. The dominant DNA markers should be Scottish and English.
My paternal grandfather is from Russia, near the Volga river north of Volgograd and south of Saratov. He was German ... descended from German immigrants brought in my Catherine the Great in the late 1700s. The German communities on the Volga did not mix genes with the local Russians so the haplotypes will be German. This is mostly why I'm almost 25% German.
My paternal grandmother is from Volhynia in northern Ukraine. Many of her ancestors were German having recently (1700s) settled in the regions from Germany and German-speaking parts of Poland. Those families mixed with the local populations of Poland, Lithuania (now Belarus), and northern Ukraine.
The trace Scandinavian haplotypes could come from either side of my family through Poland/Germany or through Scotland/Ireland.
Ancestry.com identifies all my DNA relatives who have had their DNA tested. There are 73 of them in all but none closer than 4th cousin. Fortunately, some of them seem to related to my paternal grandfather. That's the link I wanted to explore so I'll be getting in touch with them.
If you add in the other bits then I've got all of Europe covered except Italy. That doesn't explain why I like spaghetti & meatballs and pizza.
1. The DNA analysis is done in a lab in Ireland!