I know sod all about the logic sampler, is it backward/forward compatible with previous or new models ? Which version are you using ? (Info for others to help you)
I’d have thought it most likely to occur with instruments that people have tried converting between different formats and wasn’t apparent at the time, or in the tools they were using.
Can you do anything with them, rework them or otherwise utilise the samples ?
If not, it might be worth contacting the author of that specific conversion or instrument for a chat about it.