New chain

Hello Reddit

I have bought a new chain so I can change between to chains. The old chain is a Sram Force Flattop and the new one is a SRAM Force Flattop E1.

After installing the new chain the chain jumps on the front chain ring.

Any ideas what is going wrong? It’s the same in all the gears. The old chain, cassette and chain ring has been used for 2.000 km.

Is the e1 chain not compatible or can any one help what is going wrong? Chain length is the same.

Thank you in advance