Everything that is not a proven-paying loop: the debt costs more than the collateral earns, or the spread could not be computed at all. Where it is negative, levering lowers the return rather than raising it, and a positive net APY here is still lower than it would be unlevered. Markets that cannot be borrowed against at all appear in neither tab, and neither does Pendle PT collateral: a PT exists to be levered, so when its fixed rate is under the debt cost it is listed under All alone.