We had carpet installed last August that is a low pile loop style. After installation there was a slight lump along where they seamed it (couldn't really see seam, just the lump). They said it would lay flat after we lived on it for a while. It never did and they came out a month ago to re-stretch the lump line but that made it worse (they used low tape and worked on it for 3 hours but it didn't help and actually made the lump more pronounced). They ordered new carpet but when the crew came to install yesterday he said I would have the same lump problem because of the low pile and loop of carpet. Is this correct? It's hard to imagine you can't seam this type of carpet without a lump. I can understand seeing a slight seam line but why the lump? I do not want a higher pile or cut pile carpet. My room is 15 x 21 and this carpet only comes in 12' roles.