I think the issue is that you can have only two custom strips in VMC. This is a VMC limitation. VMC Menu Mender will let you create more than two custom strips, but they will not display. Menu mender can not (yet) open/edit strips that are created for a single user (e.g. Yougle). So, in order to delete those strips you would have to remove them using VMC. Once all custom strips are removed, you can use VMC Menu Mender to add back in the two you want.
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