Heard of this with cells in Tamriel; for this reason removed all LAND edits so that there's less load on the engine when moving through exteriors. Haven't ever heard of it in Shivering Isles and there are no LAND resources in the USIP and never were. If you ever see this again, just save/quit/exit/launch/load and it should be fine.
I'll check this area out but I doubt I'll find anything wrong.
Edit: Went there, placed a marker, ran top speed several cells away so it was out of the cache, ran back top speed, fine, repeated three times, fine. This is with BOINC running on all cores, my machine acting as a proxy to three others and listening to some choice Bach on WinAmp at the same time.
Seems to be OK. Just one of those random things the engine likes to do.