What was the eventual resolution? When you got the blades off, was there an obvious material/substance residue? The Dynelite blades have an aluminum sleeve and the shafts you are using are not the same materials used in Sawyer composites, which can result in the issue experienced.
As a note, all Sawyer products are fit for their intended purpose prior to leaving the factory, so fit with a different brand of shaft may be an issue. Simple solution, pair a Sawyer shaft with a Sawyer blade in matching ID.