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This can happen in some cases when a mix of dissimilar GRIB messages are placed together in one file.
Let's say you have a GRIB message M1 with 5 keys in its MARS namespace: stream, step, levtype, levelist and param. And another message M2 has 4 MARS keys: stream, step, levtype, param.
grib_ls works by taking the keys in the namespace of the first message and uses those same keys for all subsequent messages. So it will display those keys in the first row of its output.
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This can be overcome with the use of the "-j" option to grib_ls.
Also see: What are namespaces - ecCodes GRIB FAQ
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