Coventry City have raised this with Puma who are investigating further. Puma's suppliers had a meeting with the club following findings that some numbers had ‘lifted' off the shiny stripes of the shirt. The suppliers had then taken away a whole batch of shirts, re-pressed and then returned them to the club stocks.
It must be stressed that the washing instructions on the shirts should be followed, but any serious issues should be reported to the club for consideration.