My canopy parts have the same flaws, that's the original ones in the kit and the replacements.
I find it a little "strange" that the sprue shown at Telford has the four sprue runners and is distortion free, and that the "How to build it" book actually comments how thin and distortion free the clear parts are, backed up with a picture of said good parts?
I have another two issues with my example, with misalignment of the mould halves on sprue's A and B and also a damaged wing lower section, where an operative has carved out a large lump of flash from the centre front section and taken a piece of the wing with them.
I have emailed Airfix, and await a response....