If there are plasmids, these plasmids can keep on synthesizing proteins which can lead to many complications like cancers and autoimmune disorders. There is also a chance that these plasmids gets integrated into our germ cells DNA or they replicate with our germ cells, which can pass these plasmids into our progeny. We need more data and trails on it as even if there is a small possibility about this, that’s a very big deal. 
These vaccines companies marketed their products as mRNA vaccines and mRNAs don’t have the capacity to cause alteration into your DNA.