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Query on Class differences between QSFP-40G-CSR4

I am seeing issues with the 40Gb SFP I have.

 

The SFPs are all marked as QSFP-40G-CSR4 but some are marked Class1 other Class 1M.

If I have a pair of ports up and running with a Class 1M SFP at both ends, we’re getting link lights at both ends.

If I sub in a Class 1 at either end, the link goes out at the end with a class 1 SFP

If I sub in Class 1 SFPs at both ends, the link light goes out at both ends.

 

This suggests there’s some sort of issue with the SFPs with Class 1 marking, is anyone aware of the issue and/or how to resolve it?

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