Modded Skyrim LE has trouble with bridges, doors, etc that you have to Action open/down

[CheshireTat]

Hi, Skyrim Modders! I am a grateful user of almost 100 mods that generally work well together. I previously used NMM and Loot, and am now using Vortex. I have noticed a few issues after moving from NMM to Vortex: during most of gameplay, there is the sound of water, as if I am swimming, and in certain areas, my character will actually look like she's swimming even though she's running on ground; additionally, in places where you have to open, say, a doorway that leads through a sarcophagus, or drop a wooden bridge (i.e. Geirmund's Hall), the game is not recognizing that there is a bridge, and getting through to sarcophagus doorway takes some odd maneuvering.

 

Now, I am not a mod creator and am not terribly tech-savvy. I'm just looking to see if anyone else has come across this, knows what's causing it, has ideas to correct it, etc. At this point, I cannot complete the Geirmund's Hall dungeon because I cannot get across the entrance area where you drop the two bridges on the column.

 

Any help will be greatly appreciated!