Blade DRACs not associated to correct Chassis

I have several blade DRACs (PE M71HD) that are not correct associating to their M1000e chassis. Other blade DRACs (and other chassis) seem to be OK. (I have about 20 chassis).

NOTE: All these DRACs (blades) are in the same chassis. I have deleted the chassis and all the DRACs and run a inventory and discover .. same results.

For example:

(3) DRACs create a new chassis (10GSB01_Chassis)

(1) DRAC create a new chassis (10SB02_Chassis)

(1) DRAC create a new chassis (10SB07_Chassis)

The other (6) DRACs in the chassis, correctly associate with the correct chassis (s1enc06cmc)