If the form for your straight limb hill style bows is also straight, they will take some set after the first stringing. All of mine have a touch. No big deal and if they still shoot good for you, I don't see a problem.
Any bow coming off any type of form will not have the exact shape of the form once the bow is done. R/D bows and recurves will have some spring back to a more straight profile right off the form, and then a little more after stringing. The only way to end up with a perfectly straight Hill style bow would be to have some back set built into the form.