How do I make these editable, or stay editable?

I updated my xamarin and my visual studio about a month or so ago, and have been running into a bit of an annoyance. I cannot seem to edit the First and Second item of constraints consistently. Sometimes if its the first time I'm trying to change it, it lets me. Otherwise, it just sits here like the image I'm linking. Any idea how to make this where I can always be able to change them?

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