When you create new regions with Strip Silence, a separate anchor—based on the division value set in the Transport (1/16, 1/8, and so on)—is automatically created for each new region.
These rounded anchor values are shown in the help tag when you move any of the newly created regions, rather than an absolute anchor point that is placed at a particular sample position.
If you require this sort of precision, open the regions in the Sample Editor, and adjust the anchor point manually.