using Filter with drop down

[beethoven]

I have a large spreadsheet which has grown over time and I often use the filter to drill down on information I need, e.g. see records of a certain type.
I just noticed that in softmaker using the drop down arrow I have some criteria appearing twice. I carefully looked at these to see if I may have misspelled one and thus created similar but not identical records but this is not the case. Opening the same spreadsheet in xls there is only one listing of this record to choose from. Why would this be duplicated in softmaker and is there a way to get rid of the duplicate?

[SuperTech]

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