This issue seems to be new to version 25. If you click and select a caption in the captions tab with 'Selection follows playhead' turned on, it used to just select that caption on the timeline. However, now it also selects clips on the timeline which have targeting enabled. This wasn't the case in version 24.
To me, this change is not great design. I often use the Captions tab to edit subtitles, sometimes joining two captions together by pasting from one to another, and then deleting the empty caption. The problem is that, if I click on an empty caption and hit delete, it doesn't just delete that caption, it also deletes whatever has also been auto-selected on the timeline. If you're focussed on the Text panel, then it's easy to miss this, only to discover that multiple clips on your timeline have accidently been deleted, when all you were doing was editing captions.
The workaround is to turn 'selection follows playhead' off when editing captions. But it would be helpful if the behaviour was the same as previous versions. I'm not moving the playhead. I'm selecting a caption in the Text panel, so I don't want Premiere to act as if I am moving the playhead.