Conditional visibility bug on different breakpoints


I have a strange problem. I have a div with a text field that I apply conditional visibility on. I take the value of a slider field from the CMS “Onsite?” If it is true: it should show if it is not true it should not show.
Things work perfectly on a large breakpoint. However when I switch to a smaller one (e.g mobile) the logic does not work it applies it the other way around. I am baffled as the rule is the same on each breakpoint and takes the data from the same place but behaves differently.

Happy if you could help.
Image 1 Correct behavour on large brekapoint

Image2: same rule, smaller breakpoint completely the opposite behavour??

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