There were many many errors made by Ancestry.com in the course of digitizing from the National Archives microfilm of these records. Images off center, or not copied at all, for example. The 1942 draft records coupled the front and backs of different cards for several states.
Some of the microfilms themselves were poor quality, so unreadability may be in the original microfilm available to the public.
If you go back to Ancestry's so-called "record" (extract from the image, which is the image of the actual record) it will tell you what microfilm publication /group and microfilm roll number the records you want are on. Write the numbers down.
Then your local library's Inter-Library
Loan service can borrow the microfilm from the National Archives for you, for a few dollars per microfilm roll.
Or you can go to a National Archives Regional Center and see if they have this microfilm there (not all centers have all the National Archives Microfilm).