Can not delete my saved places in Google Maps

I have a bunch of saved places like this that I can not delete them:

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After clicking on it, does not appear as saved (save button does not have the green flag on it)

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I tried to go Menu -> Your places -> Checked in -> Click on one of the categories (Want to go in my case) and it appears in the list:

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but if I click on the item, it's like if I clicked on the location of the map.

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Not related to this site, but I also tried to remove the Android application and as soon as I click on the green flag, it appears "Can not establish connection". It should be mentioned that this is not a network problem because I can click on another location without the mentioned message.

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I've found a solution to enter Google Bookmarks, but this only appears Star Places, do not favorites or Want to go.
It should also be mentioned that this only happens in some places, but not all. No idea what I do differently with one or the other.