looks to me like the hoop has gotten a little skewed. it has happened to me several times. Does it lie flat on a table surface?
The bottom head is very thin and stretches out over time or with over tensioning. Could be time for a new head.
I like my reso head tight like that, too, but they do stretch over time and need to be replaced. If it sounds OK and the snares disengage freely without hanging up on the hoop, don't worry about it.
If you do need to change the head and you'd like more clearance, Remo makes a snare side head with no collar, intended for marching snares. I've had one drum where the positioning and orientation of the throw-off necessitated using that head, and it's never a bad choice.
I notice that there is a wrinkle in the strap on the wires going out to the butt plate/throw off. This could indicate that there is not even tension on the wire set, that the outer edge on the wrinkle side may have less tension than the other side. Unequal tension across the wire set can lead to broken wires. I would change the strap material, adjust the wrinkle out, or switch to non stretch strings. Since I cannot hear of feel the wires, you will have to judge this.
When I put the snare on a flat surface and hit it, the sound does get kinda muffled.
Well, that will happen with any drum I think what he meant was that you should simply check whether the hoop laid flat against the surface or if it was uneven around the drum, which would obviously mean that the hoop is being bent.