Stuck on "Tap Portal to Interact"

I recently claimed my first portal - yay me! - but since doing so, that portal is highlighted (regardless of my distance to it) by a marker that says "Tap Portal to Interact". It no longer shows me nearby portals because it seems to think I'm still in the tutorial, even though I followed the steps like it showed me (and then repeated them several times, I did the apparently-standard route of deploying all eight resonators roughly equidistant from one another at the outer edge of the portal's action radius). Here's what all I've tried to clear it:

• I "visited" that portal from my Portal Key and tapped the portal like it wanted. It brought up the portal menu with nothing highlighted by a marker, but in the background I could still see the marker on the portal telling me to tap it. Sure enough, when I left that menu, the marker was still there.
• Force Sync
• Started and Aborted the Training missions having do with Resonators. The other marker put itself over the Training markers, making it where I couldn't read the instructions to complete the Training missions even if I wanted to.