Re: How to translate and snap a selected surface
At the top of the image, you can see that it says there are 3 vertices selected.
You may have extra vertices in the model or you may be slightly moving the mouse when clicking (clicking should only select the closest).
Watch the text at the top to see when you are selecting the vertices.
Perhaps do an Object->Optimize-vertices on the model and see if that removes any duplicate vertices.
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