One signature covers social actions for 30 days. It is kept in this browser. You sign again on another browser or device, with another wallet, or after the 30 days. Actions such as saving your profile, voting, payments and claims ask every time by design.
If the same request returns again and again, check that you are using the same wallet account and that the browser keeps site data. Private windows and blocked site data cannot keep the signature. Reject any prompt that asks you to approve a transaction or spend tokens when you only wanted to post.