When you use any dynamic text, such as {param1} or {keyword}, you must make sure you don’t end up with ads that exceed the following character limits:
Ad titles: 50 characters & Ad text: 35 characters
Ad titles: 25 characters & Ad text: 71 characters
Ad titles: 35 characters & Ad text: 85 characters
Ad titles: 15 characters & Ad text: 50 characters