Maybe it's just happy to see you.
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I believe your cross over, binding post and fuse wiring are inside behind this area, if it sounds okay nothing to worry about. If you keep pushing it there's a chance of disrupting some of the soldering or wiring. I can feel little prongs behind the sock on my 3.7 I too but it's the way they are made.
Relax enjoy the music.
You can take a heat gun and wave it in front of the warp and it will tighten. If you keep the gun stationary at any point you will burn the grill cloth and possibly the driver. Wave the gun and test the cloth with your hand. It can get very warm but not hot. This is best done with the grill off. This is have the diaphragm is tightened in the first place. It is stretched across the frame then hit with a heat gun. ESLs are the same way. Every15 years or so I replace the grill cloth on my speakers (they need it now) and while I'm in there I tighten all the diaphragms with the gun. Then they have to break in all over again.