No contradiction
The patriarchs died looking by faith at the distant horizon, looking forward to the day when their heavenly promises would go from faith to sight. Dear believer, you need consider the lives of these great patriarchs "so that you will not be sluggish, but imitators of those who through faith and patience inherit the promises." (Heb 6:12+)
Note that beginning in Hebrews 11:13 and going through verse 16 the writer takes a break and instead of giving examples of saints who expressed faith, he comments on the nature of the faith that he has been illustrating in this individuals. Notice that one could go from Hebrews 11:12 to Hebrews 11:17 without skipping a beat.
As Swindoll says "At this point, the writer of Hebrews sets aside the palette of paints he had been using to fill his canvas with examples of faith. He steps back, as it were, gestures at the procession of personalities he’s been painting, and makes a sweeping statement: “All these,” he says, “died in faith, without receiving the promises”. Wait . . . didn’t Abraham make it to the Promised Land? Didn’t Sarah have her promised child, Isaac? Yes, but what they experienced in this life was merely a foretaste, a shadow of things to come. Abraham didn’t receive the full promise, just a down payment. Abraham and Sarah had only one child—the promise was for descendants “innumerable as the sand which is by the seashore” (11:12). The land in which he sojourned was indeed the Promised Land, but he, Sarah, Isaac, and all their household lived there as “strangers and exiles on the earth” (11:13; cf. 1 Pet. 2:11). (Swindoll's Living Insights New Testament Commentary – Hebrews)
J.