It's possible that the objects are grouped. If so, you can select objects within a group with the Group Selection tool, or you could ungroup the objects.
Or in the Layers panel you could click the target, circle on the right side of the layer, which will select only the objects on that layer.
Of course, you could also ungroup the objects.
I can't be certain that grouping is the issue without a screen capture of the Layers panel.
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